Condo Conversion Underwriting: Sellout Schedule, Absorption Rate, and the Convert-vs-Hold Decision

Key Takeaways

What a Condo Conversion Is

A condo conversion is the legal and physical transformation of an existing rental property (most commonly a multifamily apartment building, but sometimes an office, hotel, or warehouse) into individually owned condominium units offered for sale. The process involves filing a condominium declaration with the local recording office, establishing a homeowners association (HOA), renovating units to for-sale standards, and selling individual units to buyers over a sellout period.

The economic premise is simple: in many markets, the aggregate value of individual condo units exceeds the value of the same building as a stabilized rental property. A 100-unit apartment building generating $2.4 million of net operating income and valued at $40 million as a rental (6.0% cap rate) may be worth $58.7 million as individually sold condos at an average of $587,000 per unit (the worked example below). The spread between the rental valuation and the condo sellout value, after accounting for conversion costs, selling expenses, and the time value of money, is the conversion profit.

Not every rental building is a conversion candidate. The economics work when three conditions align: (1) per-unit condo prices in the submarket exceed the per-unit rental value by enough to cover renovation, carry, and selling costs (about 34% in the worked example below), (2) the building's physical condition supports renovation to for-sale standards at a reasonable cost per unit, and (3) the legal and regulatory environment permits conversion (some jurisdictions restrict or prohibit conversions of rent-stabilized buildings, require tenant purchase rights, or impose lengthy notification periods).

The underwriting framework for a condo conversion differs fundamentally from a hold-and-operate rental analysis. A rental analysis uses stabilized NOI, a capitalization rate, and a terminal value at disposition. A conversion analysis uses a sellout schedule: the month-by-month projection of unit closings, gross sale proceeds, selling costs, and net cash flow, discounted back to a present value. The sellout schedule replaces the terminal cap rate as the primary valuation mechanism.

Gross Sellout Value

Gross sellout value (GSV) is the total revenue from selling all condominium units at their asking prices before any deductions. It is the top-line number in the conversion pro forma and the starting point for the entire analysis.

Calculating GSV requires pricing every unit individually, then summing the prices. A 100-unit building with a uniform $350,000 price has a $35 million GSV. In practice, units are rarely priced uniformly. Floor premiums, view premiums, unit size differences, renovated vs. original condition, and parking assignments all create pricing dispersion. A well-underwritten GSV reflects this dispersion rather than averaging it away.

The inputs to GSV are comparable condo sale prices in the immediate submarket, adjusted for condition, size, floor, view, and amenity package. The valuation method is a discounted sellout analysis: project the closings, deduct selling costs, and discount the net proceeds to a present value.

Three adjustments convert GSV to net sellout value (NSV):

1. Brokerage commissions. Typically 4% to 6% of gross sale price. The developer usually hires a project sales team (2% to 3% of gross) and offers a co-broke commission to buyer agents (2% to 3%). In markets where buyer agency compensation has shifted post-NAR settlement, the developer may offer a smaller co-broke or none, though a co-broke still helps maintain buyer-agent traffic.
2. Closing costs and credits. Transfer taxes, title insurance (if paid by seller), recording fees, and buyer closing cost credits. In low-transfer-tax markets without heavy credits these can total 1% to 2% of gross; high-transfer-tax or credit-heavy markets run well above that. Transfer tax rates vary by state and municipality (New York City's RPTT is 1% to 1.425% of price on residential units; Florida charges $0.70 per $100; Illinois charges $0.50 per $500 at the state level plus local surcharges). Developers frequently offer closing cost credits of $5,000 to $15,000 per unit as an absorption incentive, particularly in the early and late stages of sellout.
3. Marketing and sales center costs. The sales center buildout, marketing collateral, digital advertising, and staging costs are typically 1% to 2% of gross for a conversion (lower than ground-up condo development, where sales centers can run 2% to 4%). These costs are partially fixed (the sales center exists regardless of how fast units sell) and partially variable (advertising spend scales with inventory duration).

A conservative underwriting convention: deduct 8% from GSV to arrive at NSV. This accounts for 5% total commissions, 1.5% closing costs and transfer taxes, and 1.5% marketing. The actual deduction should be built up from local comparables and specific deal terms, but 8% is the sanity-check range for suburban conversions in moderate-cost markets. Urban luxury conversions may require 9% to 11% due to higher transfer taxes and marketing spend.

Unit Pricing Strategy

Unit pricing in a condo conversion follows the same principles as any for-sale residential development, but the conversion context adds constraints. The units already exist. Their sizes are fixed. Their layouts are fixed. The developer cannot redesign a floor plate to maximize pricing. The pricing strategy must work with the existing unit mix.

The standard pricing framework uses four tiers of adjustment to a base price per square foot:

1. Base price per square foot. Established from comparable condo sales in the submarket, adjusted for condition and amenity package. If comparable one-bedroom condos in the area trade at $375 to $425 per square foot in renovated condition, the base for a conversion project delivering renovated units should fall within that range. If the conversion delivers units in original condition with an improvement allowance, the base drops by the anticipated per-square-foot renovation cost ($50 to $100 per square foot for a moderate renovation).
2. Floor premium. Higher floors command a premium. Illustrative schedules: a 4-story garden-style walkup might apply 0% for the first floor, 1.5% for the second, 3% for the third, and 4.5% for the fourth. A 12-story mid-rise might apply 0% for floors 2 to 4, 2% for floors 5 to 7, 5% for floors 8 to 10, and 8% to 10% for floors 11 to 12 (roughly 1% per floor). Calibrate the steps to resale data in the specific building or submarket.
3. View premium. Units with unobstructed views (water, park, skyline, mountain) command premiums of 5% to 20% over comparable units without views. Interior-facing units or units facing parking lots may receive a 3% to 8% discount to the base. The view premium interacts with the floor premium: a high-floor unit with a view captures both adjustments.
4. Unit type and layout adjustments. Corner units with additional windows typically receive a 3% to 5% premium. Units with balconies or patios may command 2% to 7% premiums depending on the market. Units adjacent to elevators, trash rooms, or mechanical equipment receive discounts of 2% to 5%. End units in garden-style buildings with additional side windows command premiums similar to corner units.

The aggregate pricing schedule must be internally consistent. If a building has 30 one-bedroom units, 50 two-bedroom units, and 20 three-bedroom units, the two-bedroom price should exceed the one-bedroom by roughly the additional square footage times the base price per square foot, plus any bedroom count premium. Markets vary on whether additional bedrooms carry a premium beyond the raw square footage. Suburban family markets typically price additional bedrooms at a 2% to 5% premium above the square footage value. Urban markets with smaller household sizes show less bedroom premium.

A practical approach: build the pricing schedule in a matrix with unit type on one axis and floor/exposure on the other. Fill in the base prices first, then layer adjustments. Sum the column to confirm the GSV. Walk the schedule against the five or six most recent comparable sales and adjust if any unit type is priced more than 10% above or below the comp-adjusted range. If you cannot find support for a price, the price is wrong.

Absorption Rate Estimation

Absorption rate is the pace at which units sell. In condo conversion underwriting, it is measured in units per month (or closings per month, which is different from contracts per month because of the contract-to-closing lag). The absorption rate is the single most sensitive variable in the conversion pro forma. It determines the length of the sellout period, which determines the carrying costs, which determines the net present value.

Thesis Driven's absorption rate guide calls slow absorption "the assumption that quietly destroys IRR." For a for-sale conversion, it helps to think of absorption as the product of three forces: market demand (how many qualified buyers exist in the submarket at the offered price point), competitive supply (how many comparable units are available from competing projects), and project-specific factors (location, product quality, developer reputation, sales and marketing execution).

Estimating absorption for a conversion project starts with the submarket data. Pull the trailing 12-month condo sale volume from the local MLS or data provider (CoStar, Redfin, or local MLS feeds). Calculate the monthly absorption rate for the submarket: total closed sales divided by 12, divided by the average standing inventory. This gives you the submarket absorption coefficient. Then estimate your project's capture rate: what share of total submarket demand will your project capture?

A planning assumption for a single conversion project in a diversified submarket is a capture rate of 5% to 15% of total monthly demand; test it against the sales pace of competing projects. If the submarket absorbs 40 condo units per month across all projects and your project captures 10%, your expected absorption is 4 units per month. If the submarket absorbs 80 units per month and you capture 8%, your expected absorption is roughly 6 units per month.

Absorption Benchmarks by Project Type

Two factors that institutional underwriters frequently miss. First, absorption is not linear. Most conversion projects follow an S-curve: slow initial sales during the presale period (buyers are cautious before the project is real), accelerating absorption during the middle third of sellout (social proof builds, the project is visibly progressing), and deceleration in the final third (the remaining units are the hardest to sell because they are the least desirable or the most expensive). Second, absorption interacts with pricing. If sales stall, the developer faces a choice between holding price and extending the timeline or cutting price and accelerating absorption. The pro forma should model the expected absorption curve, not a flat monthly rate.

Sellout Schedule Construction

The sellout schedule is the month-by-month projection of unit closings, gross sale proceeds, selling costs, and net cash flow from the conversion. It is the core deliverable of the conversion underwriting process. Every other number in the pro forma flows from the sellout schedule or feeds into it.

A sellout schedule has six columns for each month:

1. Units closed. The number of units that close (transfer title) in that month. This is driven by the absorption rate estimate, shaped by the S-curve, and constrained by presale requirements and construction completion.
2. Cumulative units closed. Running total of units closed to date. When this equals the total unit count, the project is sold out.
3. Gross sale proceeds. The sum of closing prices for all units closing in that month. This is not a flat average times units; it should reflect the specific units projected to close (lower-priced units tend to sell first, higher-priced units later, though this varies by project).
4. Selling costs. Commissions, transfer taxes, closing cost credits, and per-closing transaction costs for that month's closings. Typically 6% to 10% of gross sale proceeds in moderate-cost markets.
5. Net sale proceeds. Gross minus selling costs. This is the cash received by the developer from that month's closings.
6. Cumulative net sale proceeds. Running total of net cash received from all closings to date.

Three additional rows run alongside the sellout schedule:

• Operating expenses on unsold units. The developer pays HOA fees, taxes, insurance, and maintenance on unsold units. These costs decline as units close and transfer to individual buyers. An illustrative planning range is $400 to $800 per unsold unit per month depending on the market and building type; the worked example uses $500.
• Interest carry on conversion financing. The construction or conversion loan accrues interest on the outstanding balance. As units sell and loan principal is paid down, the interest carry declines. Monthly interest cost depends on the outstanding balance and the loan rate. At an illustrative spread of prime + 2% to 4%, that is 8.75% to 10.75% at the 6.75% prime rate in effect from December 11, 2025 through September 16, 2026, and 9.00% to 11.00% at the 7.00% prime rate since September 17, 2026 (Federal Reserve Bank of St. Louis, FRED series DPRIME). The worked example uses 10.0%.
• Net monthly cash flow. Net sale proceeds minus operating carry minus interest carry. This line may be negative in the early months (before meaningful closings begin) and grows increasingly positive as absorption accelerates.

Discount Rate Selection

The discount rate applied to the sellout cash flow stream converts the future net sale proceeds into a present value. This is the second most sensitive variable in the pro forma after absorption (and in some deals, the most sensitive). On the Figure 1 schedule ($32.2 million net sellout over 18 months), moving the discount rate from 10% to 11% lowers the present value of proceeds by about $230,000 to $290,000 (without and with the 3-month presale lag), and moving it from 10% to 15% lowers it by about $1.1 million to $1.4 million.

The discount rate for a condo sellout is not the same as the discount rate for a rental hold DCF. A rental hold DCF typically uses a property-level discount rate of 7% to 10%, anchored by cap rate surveys and transaction data. A condo sellout DCF should use a rate at or above the rental rate for the same building because the cash flows are inherently riskier: they depend on individual buyer decisions, mortgage availability, local market sentiment, and the developer's sales execution. The sellout is a liquidation, not an income stream.

Discount Rate Ranges by Risk Profile

Five factors drive the discount rate selection for a specific project. The basis-point adjustments below are illustrative planning assumptions, not survey data:

1. Presale percentage. The single largest risk reducer. A project that has contracted 60% of its units before construction begins has substantially less sellout risk than a project with no presales. Each 10% increment of presales above 30% can justify a 50 to 100 bps reduction in the discount rate.
2. Market conditions. Rising for-sale prices and tightening inventory support lower discount rates. Falling prices, rising rates, and growing inventory demand higher rates. The directionality of the market matters as much as the current level.
3. Developer track record. A developer with three or more completed conversions in the same submarket has demonstrated the ability to execute. Lenders and appraisers will accept a lower discount rate for proven operators. A first-time converter faces a 200 to 400 bps premium.
4. Financing structure. A fully funded conversion with committed takeout financing carries less execution risk than a project reliant on speculative construction financing with no takeout. The financing structure can shift the discount rate by 100 to 200 bps.
5. Buyer financing availability. This is where the 2026 Fannie Mae changes matter. If the project meets Fannie Mae eligibility requirements (including the reserve minimum that rises to 15% and the insurance deductible caps), buyers can obtain conventional 30-year fixed-rate mortgages. If the project fails to meet these requirements, buyers are limited to portfolio loans, jumbo financing, or non-QM products, which reduces the buyer pool and slows absorption. A project that is not Fannie-eligible may require a 200 to 300 bps premium to the discount rate.

Presale Requirements

Presale requirements are the lender-imposed minimums for the number or dollar value of units that must be under contract before the conversion loan funds (or before the next funding draw is released). They serve two purposes: they reduce the lender's sellout risk by demonstrating market demand, and they generate cash deposits that provide a cushion against buyer default.

Illustrative presale thresholds and terms for conversion financing (actual terms are set deal by deal):

• Conventional construction/conversion lenders. 50% to 70% of total units under contract with hard deposits, or 50% to 70% of gross sellout value contracted. The higher end of the range applies to first-time developers, secondary markets, and projects with higher per-unit prices.
• Agency lenders (Fannie Mae / Freddie Mac). For projects seeking end-buyer Fannie Mae eligibility, the Fannie Mae Selling Guide (B4-2.2-02) requires that at least 50% of the total units in the project or subject legal phase have been conveyed or be under contract to principal residence or second home purchasers. Investor contracts do not count toward that threshold, so until it is met, unit buyers need financing outside Fannie Mae, which constrains the buyer pool. Under the ineligible-project rules (B4-2.1-03), no single entity may own more than 20% of the units in a project of 21 or more units, or more than 2 units in projects of 11 to 20 units (and 5 to 10 unit projects in a master association). Sponsor units that are vacant and being actively marketed for sale may be excluded from that count, but sponsor units still under lease to tenants count, which matters for a conversion with tenants in place. Newly converted non-gut rehabilitation projects with more than ten attached units also require project approval through Fannie Mae's standard Project Eligibility Review Service (PERS) process (B4-2.1-01), a gating step with its own timeline. The 2026 updates add requirements around reserve funding and insurance coverage.
• Hard money / bridge lenders. 0% to 30% presale requirements. These lenders accept higher sellout risk in exchange for higher interest rates (12% to 16%) and origination fees (2% to 4 points). Hard money is used for acquisitions where the developer needs to close before a presale campaign can be conducted, with the intent to refinance into conventional conversion financing once presales are achieved.

Hard Deposit Structures

A presale contract is only as strong as the deposit backing it. Lenders distinguish between soft deposits (refundable under various contingencies) and hard deposits (non-refundable after a specified due diligence period). Only hard deposits count toward presale thresholds for most institutional lenders.

Typical deposit structures in condo conversions:

• Initial deposit at contract signing. 5% to 10% of purchase price. Held in escrow. Refundable during a 7 to 15-day inspection period (varies by state), then goes "hard" (non-refundable).
• Second deposit at construction milestone. An additional 5% to 10% due when renovation reaches a specified completion milestone (often 50% or at certificate of occupancy). Goes hard upon payment.
• Total hard deposits at closing. 10% to 20% of purchase price, already paid and non-refundable, applied to the buyer's down payment at closing.

The contract-to-closing timeline for presale units is typically 6 to 18 months, depending on the scope of renovation. During this period, the developer carries the risk that buyers may default on their contracts and forfeit their deposits. The developer keeps the deposits (subject to state law and the specific contract terms) and must resell the unit. In a rising market, the forfeited deposit plus a resale at a higher price makes the developer whole or better. In a declining market, the forfeited deposit may not cover the price decline plus the cost of carrying and reselling the unit.

Conversion Costs and Capital Stack

Conversion costs are the capital required to transform a rental building into a condominium project. They fall into three categories: hard costs (physical renovation), soft costs (legal, design, permitting, marketing), and carrying costs (interest, taxes, insurance, and operating expenses during the renovation and sellout period).

Hard Costs

Hard costs for a condo conversion depend on the scope of renovation. Three tiers are common:

Common area improvements are required regardless of unit renovation scope. The lobby, hallways, elevator cabs, landscaping, parking areas, and any shared amenity spaces must be brought to for-sale standards. Common area costs typically add $3,000 to $8,000 per unit for cosmetic improvements and $8,000 to $20,000 per unit for substantial upgrades.

Soft Costs

Soft costs for a condo conversion include the following (dollar ranges are illustrative planning assumptions):

• Legal and condo declaration. $50,000 to $150,000 for the condominium offering plan or declaration, HOA formation documents, purchase contracts, and regulatory filings. Where a regulator must review the filing before units can close (in New York, the conversion plan must be accepted for filing by the Attorney General; in Florida, a developer may not close on a unit sale until the Division of Florida Condominiums notifies it that the filing is proper, under Fla. Stat. 718.502), budget for higher legal costs and a longer pre-sale timeline.
• Architecture and engineering. $25,000 to $75,000 for renovation plans, unit surveys, as-built drawings, and engineering assessments (structural, mechanical, electrical).
• Permitting and approvals. $10,000 to $50,000 depending on jurisdiction. Some municipalities require a special permit or zoning variance for conversion. Others treat it as a by-right change in use.
• Reserve study. $5,000 to $15,000 for a professional reserve study. Under Fannie Mae's full review rules, a lender may rely on an acceptable reserve study in lieu of the budget percentage test. The reserve study identifies all building components, estimates their remaining useful life, and calculates the annual contribution required to fund replacements without special assessments.
• Marketing and sales. $100,000 to $300,000 for sales center buildout, brochures, website, photography, staging, and digital advertising. This is a front-loaded cost: most of it is spent before the first unit closes.

Capital Stack

The capital stack for a condo conversion is structured differently from a rental acquisition. The primary difference is the exit: the rental acquisition exits through refinance or sale of the entire building, while the conversion exits through individual unit sales over a sellout period. This changes the financing structure.

A typical conversion capital stack:

• Senior conversion/construction loan. 60% to 75% of total project cost (acquisition + renovation). Interest-only, floating rate (prime + 2% to 4%), 18 to 36 month term with extensions. The lender requires a minimum presale threshold (50% to 70%) before funding renovation draws. As units sell, the loan balance is paid down through a release price mechanism (an illustrative range is 105% to 115% of the allocated loan amount per unit; some lenders sweep 100% of net proceeds until repaid). These ranges are illustrative: as Evoque Commercial notes, there is "no universal number" for presales, and leverage, presale expectations, deposit mechanics, and terms are confirmed during project review.
• Developer equity. 25% to 40% of total project cost. Funded at closing, with a portion held in reserve for cost overruns and carry during the presale period.
• Presale deposits. Not part of the capital stack directly, but presale deposits (10% to 20% of contracted unit prices) are held in escrow and applied at closing, reducing the buyer's mortgage requirement and providing the developer with evidence of demand for the lender.

HOA Budget and Reserve Study

When a building converts to condominium, the developer must establish a homeowners association (HOA) with an initial operating budget and reserve fund. The HOA budget governs the monthly fees that unit owners pay for common area maintenance, insurance, utilities, management, and reserves. Getting the budget right at the outset matters for two reasons: (1) an unrealistically low budget creates deferred maintenance problems and potential special assessments within the first few years, which depresses resale values and generates buyer litigation, and (2) an unrealistically high budget slows absorption because buyers qualify based on total housing payment (mortgage + HOA fees + taxes + insurance), and excessive HOA fees reduce their purchasing power.

Initial Budget Components

A condo HOA budget typically includes:

• Property management. $150 to $300 per unit per year for third-party management, or a percentage of the total budget (8% to 12%).
• Insurance (master policy). The building's master insurance policy covers the structure, common areas, and liability. Cost varies dramatically by location, building age, and construction type. Coastal markets (Florida, Carolinas, Gulf states) have seen sharp insurance cost increases. Illustratively, a mid-rise building in a non-coastal market might pay $400 to $800 per unit per year. The same building in coastal Florida might pay $1,500 to $4,000 per unit per year.
• Utilities (common area). Hallway and lobby lighting, elevator power, common area HVAC, water/sewer for common areas, landscaping irrigation. $200 to $500 per unit per year depending on climate and building type.
• Maintenance and repairs. Routine maintenance of common areas, elevator service contracts, landscaping, pest control, snow removal (where applicable). $300 to $800 per unit per year.
• Reserves. The contribution to the reserve fund for future capital expenditures (roof replacement, elevator modernization, parking lot repaving, exterior painting). This is the line item most affected by the 2026 Fannie Mae changes.

The 2026 Fannie Mae Reserve Requirement

Fannie Mae's current Selling Guide (B4-2.2-01) requires a budgeted replacement reserve allocation of at least 10%, measured by dividing the annual budgeted replacement reserve allocation by the association's annual budgeted assessment income. By January 4, 2027, that minimum rises to 15% (InterCap Lending). As an alternative to the percentage test, the lender may rely on an acceptable reserve study showing adequate funded reserves. This applies to projects where individual unit loans are sold to Fannie Mae. The requirement reflects lessons from the Champlain Towers South collapse in Surfside, Florida, and the subsequent wave of state-level reserve study mandates.

For a conversion developer, the 15% minimum has a direct financial impact on absorption. Consider a building with $500,000 of annual budgeted assessment income. At 10% reserves, the reserve contribution is $50,000 per year ($500 per unit per year on a 100-unit building, or $42 per unit per month). At 15%, it is $75,000 per year ($750 per unit per year, or $63 per unit per month). The $21 per month per unit increase in HOA fees ($252 per year) raises the gross income a buyer needs to qualify by roughly $590 to $900 per year (at 43% and 28% debt-to-income ratios), or cuts the supportable 30-year loan amount by about $3,200 to $3,500 at 6% to 7% mortgage rates. Small per buyer, but it shifts the marginal buyers at every price point.

A reserve study is the better tool for setting the number. If the study shows that the budgeted percentage is insufficient to fund identified capital replacements without special assessments (common for older buildings with deferred maintenance), the HOA should budget more, and the developer should disclose this in the offering documents. Buildings with fully funded reserves and a clean reserve study sell faster and at higher prices because buyers and their lenders have confidence in the building's financial health.

Insurance Compliance

Insurance requirements for condominium projects have tightened significantly since 2021, driven by catastrophic losses (Champlain Towers South), rising reinsurance costs, and regulatory response. For a condo conversion, meeting insurance standards is not optional: it is a prerequisite for buyer financing.

Master Policy Requirements

The building's master insurance policy must provide:

• Property coverage. Coverage on a replacement cost basis for the building structure and common elements, with the exception of roofs, which must be insured but do not have to be insured on a replacement cost basis (B7-3-03). The coverage amount must equal at least 100% of the estimated replacement cost value of the project improvements, including common elements and residential structures (B7-3-03 lists the acceptable forms of support, such as an insurer's replacement cost estimate).
• Liability coverage. Commercial general liability of at least $1 million for bodily injury and property damage for any single occurrence, with the HOA as named insured (B7-4-01).
• Fidelity bond / crime coverage. Required by Fannie Mae for projects with more than 20 units, unless the project qualifies for a waiver of project review or the required coverage would be $5,000 or less; state statutory requirements are accepted in place of Fannie Mae's. Coverage must equal at least three months of assessments on all units if the HOA follows Fannie Mae's listed financial controls (such as a separate reserve account); otherwise, it must equal the maximum funds in the custody of the HOA or its management agent at any time (B7-4-02).

The $50,000 Per-Unit Deductible Cap

Effective July 1, 2026 (per InterCap Lending), Fannie Mae caps master policy deductibles in two separate ways (B7-3-03): a per-occurrence deductible may not exceed 5% of the master property insurance coverage amount, and a per-unit deductible may not exceed $50,000 per unit. Where a policy has separate deductibles for different required perils, such as windstorm or wildfire, each must meet the applicable cap. A master policy that breaches either cap fails the Fannie Mae eligibility test. Buyers cannot obtain Fannie Mae-backed mortgages, and the developer must either negotiate a lower deductible (at higher premium cost), establish a deductible reserve fund within the HOA budget, or accept a smaller buyer pool limited to portfolio and non-QM financing.

The deductible cap interacts with the reserve requirement. If the master policy has a $50,000 per-unit deductible, the HOA should establish a dedicated deductible reserve sufficient to cover the maximum deductible exposure without a special assessment. For a 100-unit building with a $50,000 per-unit deductible, the maximum deductible exposure on a building-wide claim is $5 million. Building a reserve to cover 50% of that exposure ($2.5 million) would require a special assessment or a significantly elevated monthly contribution. This is why the deductible cap matters: it forces a choice between higher insurance premiums (lower deductible) and higher reserve contributions (to cover the deductible), both of which increase the monthly HOA fee and reduce buyer purchasing power.

Individual Unit Coverage (HO-6)

Each unit owner is responsible for their own HO-6 policy covering interior improvements, personal property, and personal liability. Fannie Mae requires the borrower to carry a unit owners policy when any portion of the unit interior or improvements is not covered by the master policy, or when the master policy has a per-unit deductible (B7-3-04). The conversion developer should factor HO-6 costs ($300 to $800 per year in most markets) into the buyer's total housing cost calculation when sizing the unit pricing strategy.

State-by-State Legal Framework

Condo conversion is governed by state and local law, and the regulatory environment varies dramatically by jurisdiction. A conversion that needs only a notice and a filing in one state may face tenant purchase thresholds, statutory purchase rights, or a multi-year notice to quit in another. The legal framework affects the timeline, cost, and feasibility of the conversion, and in some states it is the binding constraint on the sellout schedule.

Tenant Notice and Purchase Rights: Five Statutes

Notice periods and tenant rights differ by an order of magnitude, from a 30-day minimum notice in Illinois to a three-year notice to quit in New Jersey. Five examples from the statutes:

• Florida. Every tenant who has been a residential tenant for the 180 days preceding the notice of intended conversion has a statewide right of first refusal to purchase their unit, open for at least 45 days after the purchase materials are delivered. The developer must deliver the purchase materials within 90 days of the conversion notice or the lease is automatically extended. If the developer later offers the unit at a lower price, the tenant must be notified before the offer is published and then has at least 10 more days to buy at the lower price (Fla. Stat. 718.612). Those 180-day tenants may also extend an expiring lease on the same terms to as late as 270 days after the notice; other residential tenants may extend to 180 days after the notice (Fla. Stat. 718.606).
• Illinois. The notice of intent must be given at least 30 days and not more than one year before the declaration is recorded. Tenants must be offered their unit at the scheduled price, and the offer must stay open at least 30 days. A tenant whose lease expires within 120 days of the notice may extend to the end of that 120-day period, and for 120 days after the notice a tenant may buy the unit on substantially the same terms as any executed third-party contract (765 ILCS 605/30).
• New Jersey. To evict for a conversion, the landlord must serve a Notice to Quit at least three years before filing suit, and no action may be taken until the lease expires. Courts must grant up to five one-year stays of eviction if the tenant has not been offered a reasonable opportunity to examine and rent comparable housing (the tenant must request comparable housing within 18 months of the notice, and stays are limited to one year if the landlord gives five months' free rent as relocation compensation), and qualifying senior and disabled tenants may have protected tenancy (N.J.S.A. 2A:18-61.1(k), summarized in the New Jersey Department of Community Affairs' Truth in Renting guide). For a sellout model, this is a multi-year occupancy constraint, not a notice period.
• New York City. Under General Business Law 352-eeee as amended by the Housing Stability and Tenant Protection Act of 2019 (S.6458, Part N), the conversion plan must be accepted for filing by the Attorney General, and tenants in occupancy then have a 90-day exclusive right to purchase their units. A non-eviction plan cannot be declared effective until purchase agreements are signed for at least 51% of all dwelling units by bona fide tenants who were in occupancy when the Attorney General accepted the plan (the threshold was previously 15%). Eviction plans are limited to plans submitted before the 2019 amendment, so new conversions proceed as non-eviction plans.
• Washington. The declarant must give every residential tenant notice and the public offering statement at least 120 days before tenants are required to vacate, and for 60 days after the notice must offer to convey each occupied unit to the tenant who leases it. A city or county may also require, by ordinance, relocation assistance of up to three months' rent for non-purchasing tenants with household income below 80% of the area median (RCW 64.90.655).

Many other states and cities layer their own notice periods, purchase rights, insider discounts, and conversion limits on top of these. Treat any jurisdiction not covered above as unknown until counsel has checked the statute and any municipal ordinance for the specific building. Where tenants hold purchase rights, insider sales at the offered price can accelerate early absorption because those buyers need no marketing effort, while any required discount reduces GSV on those units.

Rent-Regulated Units

In jurisdictions with rent regulation, converting regulated units is either restricted or subject to stringent requirements. In New York City, non-purchasing tenants under a non-eviction plan cannot be evicted for failing to buy or because their tenancy expires, and eviction proceedings against eligible senior citizens and eligible disabled persons are barred except as the statute provides. Regulated tenants who do not buy keep their tenancies, so the sponsor can sell those units only as they become vacant, which can take years. Other cities with rent regulation impose their own conversion restrictions, which require local verification.

The legal due diligence for a conversion should include a full review of applicable state and local conversion statutes, rent stabilization applicability (if any), tenant notification requirements, tenant purchase rights, HOA formation requirements, and any municipal conversion moratoria or quotas. Engage local counsel who specializes in condominium law before committing capital.

Convert-vs-Hold NPV Analysis

The convert-vs-hold decision is the binary question at the center of every condo conversion underwriting: is the property worth more as individually sold condominiums or as a held rental asset? The analysis compares the NPV of the conversion sellout to the NPV of continuing to operate the property as a rental.

The framework is straightforward. On one side, calculate the NPV of the conversion: net sellout proceeds over the sellout period, minus conversion costs (renovation, legal, soft costs), minus carrying costs (interest, taxes, operating expenses on unsold units), discounted at the appropriate sellout discount rate. On the other side, calculate the NPV of the rental hold: the present value of the operating cash flow stream over a 7 to 10 year hold period, plus the present value of the terminal sale at an exit cap rate, minus the initial acquisition cost, discounted at the rental property discount rate.

The two NPVs are not directly comparable without adjustment. The conversion sellout is a 12 to 36 month execution with a definitive end date. The rental hold is a 7 to 10 year hold with ongoing operating risk and a terminal sale assumption. The risk profiles are different. The capital requirements are different. The time horizons are different. Three adjustments make the comparison apples-to-apples:

1. Normalize for equity invested. The conversion requires renovation capital on top of the acquisition cost. The rental hold requires only the acquisition cost (plus ongoing capex reserves). Compare returns per dollar of equity invested, not total NPV.
2. Normalize for time. Convert the conversion NPV to an annualized IRR that is comparable to the rental hold IRR. An 18-month conversion that generates a 25% total return is not the same as a 7-year rental hold that generates a 25% total return. The annualized return on the conversion is roughly 16%; on the rental hold it is 3.2%. The reverse check matters too: the conversion returns capital years earlier, so ask what rate that capital must earn after it comes back for the conversion to match the hold's ending wealth.
3. Account for optionality. The rental hold preserves the option to convert later. The conversion is irreversible (once units are sold, they cannot easily be reassembled). The option value of waiting is real and should be priced as a required IRR premium over the hold. This article uses an illustrative hurdle of 200 to 400 bps; the right number is a judgment call for the investment committee, not a market standard.

Worked Example: 100-Unit Conversion

Consider a 100-unit mid-rise multifamily property in a close-in suburban submarket. The building was constructed in 1998, is in good structural condition, and has a mix of one-bedroom (30 units, 750 sf avg), two-bedroom (50 units, 1,050 sf avg), and three-bedroom (20 units, 1,300 sf avg) units. All inputs below are illustrative assumptions chosen to show the mechanics, not market data. Both sides of the comparison use 65% leverage so that equity returns are comparable.

Current Rental Operation

Conversion Pro Forma

The two carry lines come from the monthly schedule rather than a plug: the loan is fully drawn at closing, interest accrues on the outstanding balance, and the operating carry runs on every unit not yet closed, including the 300 unit-months of the presale period. The carry budget is funded at closing as a reserve.

Sellout Assumptions

Convert-vs-Hold Comparison

The unlevered conversion figures exclude interest: all non-carry costs ($45,950,000) at closing, operating carry monthly, and net sale proceeds as units close. In this example, the conversion wins on annualized return and the hold wins on dollars. The conversion's levered IRR is 17.2% against 10.7% for the levered hold, a premium of about 650 bps, and the unlevered comparison points the same way. But the hold produces a 1.86x multiple and $11.97M of profit over 7 years, against 1.26x and $4.54M for the conversion over 21 months, and the conversion needs $3.31M more equity. The tiebreaker is what the conversion's equity earns after it comes back in months 14 to 21. In this model, the conversion matches the hold's Year 7 ending wealth only if that returned capital (and the $3.31M of equity the hold never needed) compounds at about 8.0% a year. If the sponsor can redeploy above that rate, convert; below it, hold.

The base case clears the illustrative 200 to 400 bps optionality hurdle, but the margin depends on pace and price. If absorption runs at a flat 4 units per month instead (a 25-month sellout, 28 months in total), carry rises by about $215,000 and is paid from sale proceeds, profit falls to $4.32M, and the levered IRR drops to 12.1%, only about 140 bps over the hold and below the hurdle. Price is the bigger lever: breakeven is $537,700 per unit, so an average price about 8% below the base case erases the profit.

Sensitivity matters. Run the conversion pro forma at three absorption rates (base case, slow case at 70% of base, fast case at 130% of base) and three pricing scenarios (base, 5% down, 5% up). The nine-cell matrix shows how the return profile shifts. If conversion only works at base-case or better, the risk-adjusted decision may favor the rental hold, particularly for risk-averse institutional capital.

Five Mistakes Practitioners Make

1. Using a flat absorption rate instead of an S-curve. A flat assumption of 5.6 units per month for 18 months looks clean but overstates early cash flow and understates carrying costs. The S-curve (slow start, peak middle, slow finish) more accurately reflects how condo projects actually sell. In the worked example, swapping the S-curve for a flat schedule raises the present value of net proceeds at 10% by only about $380,000 (0.8%), but because the loan is repaid sooner it also cuts interest and operating carry by about $560,000, lifting projected profit from $4.54M to $5.10M and the levered IRR from 17.2% to 19.3%. Most of the error sits in the carry, not the discounting.

2. Ignoring the Fannie Mae eligibility test. A condo project that does not meet Fannie Mae requirements (reserve minimums, insurance deductible caps, owner-occupancy ratios, litigation status) loses access to the largest pool of mortgage capital. Buyers are limited to portfolio and non-QM loans with higher rates and stricter qualifying standards, which shrinks the buyer pool and slows absorption. In the worked example, a slowdown from the base S-curve to a flat 4 units per month cuts the levered IRR from 17.2% to 12.1%. For a non-gut conversion of more than ten units, the Fannie Mae PERS approval is itself a gating step to schedule. Underwrite the Fannie Mae eligibility test as a hard constraint, not a nice-to-have.

3. Underestimating carrying costs during the tail. The last 10% to 20% of units in a conversion are the hardest to sell. They are the least desirable units (ground floor, interior facing, adjacent to mechanical rooms) or the most expensive (penthouses in a price-sensitive market). Carrying costs on unsold units do not decline linearly. The per-unit carrying cost actually increases as the denominator shrinks because fixed costs (management, insurance, common area maintenance) are spread over fewer unsold units. Model the tail explicitly.

4. Applying a rental cap rate to condo sellout proceeds. The condo sellout NPV should be calculated using a sellout-specific discount rate (8% to 20% in this article's framework), not a rental cap rate. The two rates serve different purposes and reflect different risk profiles. On the Figure 1 schedule with a 3-month presale lag, discounting at a 6% cap rate instead of a 10% sellout rate overstates the present value of sellout proceeds by about 4%, and 5% instead of 15% overstates it by about 11%. That sounds small, but in the worked example the 6% versus 10% gap is about $2.0M, nearly half of the $4.54M projected profit, which is enough to make a thin conversion look good on paper.

5. Forgetting the conversion is irreversible. Once the condominium declaration is recorded and units are sold, the building cannot easily be reconverted to a rental. Reassembling a 100-unit condo building by purchasing all individual units is theoretically possible but practically prohibitive. The conversion decision eliminates the option to hold the rental stream. That optionality has value, and the conversion pro forma should price it by requiring an IRR premium over the rental hold before the conversion is approved (this article uses an illustrative 200 to 400 bps).

Model It in Apers

Related Articles

• DCF vs Direct Capitalization: When to Use Each. The valuation framework underlying the sellout DCF. How the two approaches compare and when the sellout schedule DCF is the appropriate tool.
• Multifamily Underwriting Fundamentals. The rental hold side of the convert-vs-hold analysis. How to underwrite the stabilized rental property that is the conversion candidate.
• Value-Add Multifamily: Renovation Premium Modeling. The renovation economics that apply to the physical conversion. How to size renovation budgets and model the premium achieved through unit upgrades.
• Hold Period Analysis: IRR vs Equity Multiple. The return metrics used in the convert-vs-hold decision. How to compare the short-duration conversion IRR against the longer-duration rental hold return.
• Multifamily Development, Construction, and Lease-Up. The ground-up development process that parallels the conversion renovation. How construction timelines, cost structures, and lease-up absorption compare to conversion sellout.