Trophy vs Class A vs Class B Office: The 2026 Stratification and Class B Repositioning Math

Key Takeaways

The 2026 Stratification Call

The 20-year mental model in which "Class A office" was a single category is dead. The 2024–2026 flight-to-quality data has split the institutional office market into four operating tiers: Trophy at the top, Class A in the well-amenitized middle, Class A-minus as the contested zone where credible repositions land, and Class B as the structurally challenged bottom. The call between those four tiers governs every other underwriting decision an acquirer makes. New York recorded 313 leases at $100 PSF or more in 2025, up from a record 212 in 2024, including 28 at $200 PSF or more, per JLL's annual top-of-market report as cited byThe Real Deal. In the same article, Trepp's CMBS office delinquency rate hit a record 12.34% in January 2026. Two series moving in opposite directions at once is what bifurcation means.

TheNYC Comptrollershows the same split in occupancy. Almost all of the improvement in Manhattan took place at the high end of the market, in the 5-star buildings that account for about 10% of office space. Occupied space in those buildings grew by approximately 11.5 million SF, while occupancy in the rest of Manhattan's office stock dropped by 43 million SF between the fourth quarter of 2019 and the first quarter of 2025. The stratification is not coming; it has already happened.

This article is the practitioner reference for the 2026 office stratification call and the math that follows from it. It walks the four-tier taxonomy with rent PSF, availability, and cap rate bands by tier and market band; the basis-to-stabilized math for a Class B reposition to Class A-minus; the office-to-residential conversion path as the alternative; and a single 350,000 SF Sun Belt CBD Class B building carried through three paths side by side: reposition, convert, sell at land. The audience is value-add office acquisitions teams, sponsor GPs sizing capex against the tier rent spreads, debt brokers underwriting bridge-to-perm, capital-markets brokers defending a Class A-minus reposition pro forma, and the workout cohort holding Class B paper that has matured into the 2026 environment.

The Four-Tier Taxonomy

The institutional office vocabulary collapsed for two decades. Brokerage market reports tracked "Class A" and "Class B / C" as two cohorts, and cap-rate sheets commonly carried a Class A column and a Class B/C column. The 2024–2026 leasing data made that collapse untenable. Within "Class A" the spread between the new-build trophies leasing at $300+ PSF and the older Class A struggling to hold occupancy in soft submarkets is wider than the spread between Class A and Class B has historically been. The four-tier taxonomy below is the framework this article uses; the tier names are working labels, and the rent and cap rate bands attached to them are working assumptions, not published statistics.

Trophy: roughly the top 10% of stock

Trophy is the cohort buyers describe by name. In Manhattan that means towers like One Vanderbilt and 9 West 57th, where the record leases in this article were signed. The Comptroller's 5-star category, about 10% of Manhattan office space, is the closest published proxy for the tier. The defining attributes are post-2015 construction or full-trophy repositioning, floor-plate efficiency engineered for the modern occupier, hospitality-grade amenity, blue-chip occupier roster, and submarket dominance. The cohort prints low availability and rents at meaningful premiums to the submarket Class A average.

Class A: the well-amenitized middle

Class A is the well-amenitized, modernized standard: current MEP, contemporary finishes, credible amenity, professional management, direct competition from trophy only at the edges. Class A in 2026 leases solidly at the submarket Class A average. It is the broadest of the four tiers and the natural comp set for a credible Class B reposition.

Class A-minus: the contested zone

Class A-minus is the label for the contested middle. Two populations live in it: older Class A buildings that have aged out of the modern Class A standard without being functionally obsolete, and recently repositioned Class B buildings that have credible amenity and modernized systems but cannot quite price at the Class A line. In Table 2, matching points of the Class A and Class A-minus ranges differ by $15–30 PSF in gateway markets and by $4–6 PSF in Sun Belt CBDs. The tier holds occupancy meaningfully above commodity Class B, which is the entire economic rationale for the reposition path. Class A-minus is the central underwriting battleground.

Class B: the structurally challenged bottom

Class B is the commodity tier: pre-2000 construction, outdated MEP, surface or no amenity, dated finishes, lower-tier occupier mix. In this article's working bands the cohort prices at double-digit cap rates and carries availability well above the upper tiers. The Comptroller finds that across the rest of the Manhattan market outside the 5-star tier, both availability and vacancy remain elevated. In a large share of the cohort, the answer is not a reposition at all but a conversion, a land-value sale, or a workout.

Table 1: The four-tier office stratification. The cohorts are not synonyms for age; a 1990s-vintage asset that has been fully repositioned to current standards reads as Class A or Class A-minus, and a poorly-maintained 2005 building can read as Class B in tenant decision-making.

Rent, Occupancy, and Cap Rate by Tier

Published tier-level statistics are thin outside Manhattan, so this section separates what is sourced from what is a working assumption. The top-of-market Manhattan prints and the Comptroller figures are sourced. Table 2 and the cap rate bands are working assumptions. The dispersion within each tier across market bands is meaningful enough that an underwriting using gateway Class A rents on a Sun Belt asset overstates the rent by about 2.4x ($90 against $37 at the Table 2 midpoints). The discipline is to read the tier and the market band together, then triangulate against tier-specific comps from the immediate submarket.

Rent PSF by tier and market band

Gateway trophy rents anchor the high end. As reported byThe Real Deal, 9 West 57th signed a 10-year, 5,063 SF lease on its 50th floor at $327.50 PSF, surpassing the prior record of $320 PSF set at One Vanderbilt in 2022 (a 9,871 SF lease to GFL Environmental). Kyndryl signed at One Vanderbilt at $305 PSF for 6,300 SF in 2025, and Manhattan's average asking rent reached $76 PSF at the end of 2025, its highest level in five years. On Third Avenue, a long-time discount corridor,The Real Dealreports a 20,000 SF lease at 605 Third Avenue with an asking rent of $120 PSF, a record for the building. Colliers puts the Third Avenue average asking rent at just under $70 PSF, against more than $113 on Fifth Avenue and $114 on Park Avenue. The Sun Belt bands in Table 2 are working assumptions with the same structure at a lower level: Sun Belt midpoints run 37% (Trophy) to 49% (Class B) of gateway midpoints.

Table 2: Working asking-rent bands by tier and market band, 2026. These are illustrative assumptions used throughout the article, not survey data. Only the top-deal prints in the gateway trophy row ($200–$327) are sourced (The Real Deal, JLL top-of-market report). Replace every cell with submarket comps before underwriting.

Occupancy and availability by tier

The occupancy spread is the cleanest measurable proof of the stratification, and the Comptroller's figures are the sourced anchor: 5-star buildings gained about 11.5 million SF of occupied space while the rest of Manhattan lost 43 million SF. Even in a recovering corridor the gap shows. Per Colliers data cited by The Real Deal, Third Avenue availability has dropped from a post-pandemic peak of about 27% in 2022 to 19.5%, which the reporting itself describes as still elevated. The availability bands in Figure 1 are working assumptions, not published statistics; replace them with current submarket availability by tier.

Cap rate spread by tier

The working cap rate bands in this article are: Trophy 6.50–7.50% on stabilized cash flow, Class A 7.50–8.50%, Class A-minus 8.50–10.0%, and Class B 10–15%+. They are illustrative and should be replaced with closed trades from the submarket. On these bands the Trophy-to-Class B spread is roughly 250–850 bps (a 10% Class B cap against a 7.50% trophy cap at the narrow end, a 15% Class B cap against a 6.50% trophy cap at the wide end). The structure is what matters: each step down the tiers costs cap rate, and the Class A-minus exit is structurally less liquid than the Class A exit, which is why the worked example exits at the low end of the Class A-minus band rather than at a Class A cap.

When Class B Repositioning Pencils

The repositioning math is the article's central problem. The thesis is straightforward: acquire Class B at a distressed basis, spend $75–155 PSF to lift it to a credible Class A-minus standard, capture the Class A-minus rent against the Class A-minus comp set, lease the building up over 24–36 months, and exit at 8.50–10.0% on the stabilized cash flow. The execution math splits on five inputs: basis, reposition cost per PSF, achievable rent at lease-up, lease-up downtime, and exit cap. Each is an independent claim that the IC memo has to defend.

Basis

This article uses $75–200 PSF as an illustrative working range for Sun Belt CBD Class B and $100 PSF in the worked example. Distressed sellers and discounted-loan fact patterns can price below any range, so the basis that matters is the one that clears the value-on-cost test below. The binding question is what capitalized Class A-minus NOI per SF can support, not what the seller paid.

Reposition cost per PSF, by line

A Class B-to-Class A-minus reposition runs $75–155 PSF excluding a facade program, with the dispersion driven by the starting condition of the asset and the depth of the amenity program. A curtain-wall program adds $5–25 PSF and takes the range to $80–180 PSF. The line-by-line stack:

Table 3: Reposition capex by line for a Class B-to-Class A-minus lift. Line ranges are working assumptions for this article, not survey data; the totals are the sum of the low ends and the sum of the high ends. The curtain-wall line is excluded on most projects and included where the existing facade is the binding constraint on the Class A-minus rent line.

Achievable rent uplift

The rent uplift is the contested input. The discipline is to underwrite the post-repo rent against the Class A-minus comp set in the submarket, not against the trophy comp set and not against the gateway benchmark. In Table 2, the Sun Belt Class A-minus band is $28–36 PSF against $22–32 PSF for Class B, a lift of $4–6 PSF at matching points of the ranges and about 19% at the midpoints ($27 to $32). A Sun Belt CBD Class B at $28 PSF that prices a $48 PSF post-repo rent is claiming the new product will lease above the Sun Belt Class A band ($32–42) and inside the trophy band ($42–55). That requires a comp set that does not exist for a Class A-minus building.

In gateway markets the same Table 2 comparison, Class B at $40–70 PSF to Class A-minus at $55–80 PSF, gives a lift of $10–15 PSF at matching points and about 23% at the midpoints. The gateway lift is larger in dollars, but gateway basis and capex are also higher, so the value-on-cost test below is what decides whether the lift pays.

Lease-up risk and the OpEx delta

Lease-up downtime is the single biggest IRR destroyer in the reposition pro forma. This article uses a 24–36 month lease-up from substantial completion to stabilization as its working assumption. The window consumes tenant improvement dollars, free rent, and broker commissions, and the bridge debt accrues over the full period. Concession levels are submarket- and tier-specific; the lease-economics detail sits inOffice Underwriting: TI, LC, Free Rent, and Effective Rent. A 12-month lease-up on a Class B reposition assumes a speed the working range does not support.

The OpEx delta after stabilization has one large line: property tax reassessment. In the worked example, stabilized expenses rise from $14.00 PSF in place to $17.50 PSF, an increase of $1.225M a year. The example assumes $1.0M of that is additional property tax and $0.225M is insurance and payroll on a higher-service operating standard. The $1.0M is about 22% of the $4.6M stabilized NOI. Other lines to size: marketing during lease-up and a higher reserve against the more amenity-heavy operating footprint.

The value-on-cost test

The reposition pencils when basis plus capex clears at the stabilized cap rate. This article uses three working screens: above 1.15x value-on-cost the reposition is credibly underwritten, above 1.25x it is institutional, and below 1.05x the deal is too thin to absorb execution variance (lease-up miss, capex overrun, exit cap stress) without breaking the equity.

Office-to-Residential as the Third Path

For the Class B asset that fails the reposition screen (the floor plate is wrong, the submarket won't lease Class A-minus at any plausible rent, the basis is too high to absorb the reposition capex), the second-best path is often conversion to multifamily. The conversion thesis has more public oxygen than it has executed transactions, but the pipeline is real. The NYC Comptroller counted 44 completed, ongoing, and potential conversions in New York City as of the first quarter of 2025, totaling about 15 million gross SF and approximately 17,400 apartments.

Gensler's feasibility screen

The screen practitioners reference isGensler's Conversions+ analysis, a building-by-building assessment tool. Gensler reports that it has now assessed more than 1,300 potential conversions and supported over 130 cities, and that only 25% of the buildings scored make suitable candidates. Context, building form, location, and floor plate size all play a crucial role. Gensler also states that conversions can be delivered at a 30% lower cost than new construction, which is a statement about cost against ground-up delivery, not a claim that conversions pencil at market rents.

J.P. Morgan's conversion guidenames the same kind of constraints from a lender's side: building bones and condition, particularly floorplate depth (a sprawling footprint often requires drilling light wells for interior rooms lacking windows), neighborhood context, amenity opportunities, zoning and permitting, and local housing supply and demand. Beyond those, size the mechanical retrofit, the envelope access, and the unit layout against the gross floor area line by line.

Conversion cost, velocity, and the subsidy reality

The worked example assumes $350 PSF of conversion capex as an illustrative figure. TheBrookings community guide to office-to-residential conversion economicsis the anchor for the range: across its six case-study markets, the average hard cost of conversion was more than $300 PSF in every city except Houston, and the lowest recent conversion cost developers cited was $145 PSF. Unit yield depends on the plate: at 600–900 SF gross per unit including circulation, 350,000 SF delivers roughly 390–580 units. The worked example uses 875 SF gross per unit, or 400 units.

The math fails without policy support in most cases. Brookings concludes that in five of six markets studied no office-to-residential conversion project was economically viable without public policy intervention, and that 16 of its 18 sample buildings had a negative NPV before incentives. J.P. Morgan describes the other side of the same coin: projects often use a tax credit paired with tax increment financing or a property tax abatement, and those tools reduce the cost to build or operate conversions, making them more feasible. The NYC Comptroller notes that 467-m, the exemption enacted in 2024, is sustaining the wave of conversions in New York, and that it requires 25% of the apartments to be reserved for families earning on average 80% of area median income and to be rent stabilized in perpetuity.

The conversions that work cluster where the subsidy stack is robust. Brookings' St. Louis example shows both the size and the limit of a stack: historic tax credits alone were worth 45% of construction cost, about $135 PSF, and credits combined with a property tax abatement, a low-interest loan, and public-realm investment to raise rents lifted the return on cost to 8.44%, 114 basis points above the local residential cap rate. Even then, the ten-year NPV essentially broke even. The conversions that fail cluster in Sun Belt CBDs without aggressive programs and in submarkets where residential demand doesn't support the delivered basis. The worked example shows why a Sun Belt CBD conversion fails without aggressive subsidy.

350,000 SF Sun Belt CBD: Three Paths

A single physical asset carried through three paths so the unit economics are directly comparable. The asset profile: 1985-vintage, 22-story, 350,000 SF urban Class B office building in a Sun Belt CBD (Atlanta, Charlotte, Nashville, or Tampa as the archetype). Currently 65% occupied, in-place rents $28 PSF average, $14 PSF operating expenses: $6.37M of revenue less $4.90M of expenses leaves $1.47M of in-place NOI. The asset trades to an institutional value-add acquirer for $35M ($100 PSF), a 4.2% cap on in-place NOI. Every input below is an illustrative assumption set in the bands above; underwriting against the stabilized post-strategy NOI is what the three paths resolve.

Path A: Class A-minus reposition

Thesis: lift to a credible Class A-minus standard, lease up to 90% at $34 PSF (the upper half of the Table 2 Sun Belt Class A-minus band), and exit at 8.5% (the low end of the Class A-minus cap band). Reposition capex is $75 PSF, the low end of every Table 3 line with no facade program: $5.25M lobby + amenity, $8.75M MEP, $3.5M elevator + life safety, $1.75M common area, $7.0M TI/LC reserve. Total reposition capex $26.25M; total cost $61.25M ($175 PSF). Stabilized rent $34 PSF at 90% economic occupancy = $10.71M revenue; stabilized expenses $6.125M ($17.50 PSF, the $14.00 in place plus the tax and operating step-up described above); stabilized NOI $4.59M ($13.10 PSF). At an 8.5% exit cap, stabilized value = $53.9M. Value-on-cost = 0.88x.

The reposition does not clear this article's screens. It is below the 1.05x floor at the base cap and falls to 0.79x at the stressed 9.5% exit ($48.3M of value). Capitalized at 8.5%, each SF of stabilized NOI supports $154 PSF of value, so an all-in cost that clears 1.15x has to be $134 PSF or less; with $75 PSF of capex that means a basis of about $59 PSF, below the working range. Value-on-cost reaches 1.0x at a rent of about $36 PSF (the top of the Class A-minus band) and 1.15x at about $38.50 PSF, which sits inside the Class A band. At $110 PSF of capex the base value-on-cost falls to 0.73x. Levered IRR on a 5-year hold is negative: with 60% loan-to-cost at a 7% interest-only rate, all costs funded at close, NOI of $1.47M, $2.5M, $3.8M, $4.59M, and $4.59M across years 1 to 5, and a year-5 sale at 8.5% less 2% costs, the equity IRR is −3.8%.

Path B: Office-to-multifamily conversion

Thesis: convert to 400 multifamily units (875 SF gross per unit) at the Sun Belt CBD Class A market rent and exit at 5.5%. Conversion capex $350 PSF: $50M MEP, $25M structural and floor-plate work, $30M plumbing risers and unit kitchens/baths, $10M common-area amenity and exterior, $7.5M development overhead. Total conversion capex $122.5M; total cost $157.5M ($450 PSF), or $394K per unit. Market rent $2,400/unit (an illustrative Sun Belt CBD Class A multifamily assumption) × 400 × 95% × 12 = $10.94M revenue; expenses $5.0M ($12,500 per unit); stabilized NOI $5.94M. At 5.5%, stabilized value = $108.1M. Value-on-cost = 0.69x. At a stressed 7.5% exit (+200 bps) value falls to $79.3M and value-on-cost to 0.50x. The conversion fails without subsidy.

Subsidy sensitivity: assume a single combined stack of credits and abatement worth 25% of total cost, an illustrative figure (in Brookings' St. Louis example, historic tax credits alone were 45% of construction cost). On $157.5M that is $39.4M, an effective cost of $118.1M against $108.1M of stabilized value: 0.91x. The stack would need to be about 31% of total cost ($49.4M) to reach 1.0x, and at the stressed 7.5% exit the 25% stack still leaves value-on-cost at 0.67x. The stack is counted once; the abatement is part of the 25%, not an additional deduction. Conversions that work cluster where subsidy programs are richer or the residential basis spread is wider; in Sun Belt CBDs, conversion is rarely the answer without that support.

Path C: Sell at land basis

If neither path clears, sell to a redeveloper at land value. Sun Belt CBD land at $50–100 PSF of building area (an illustrative range) gives $17.5–35M against the $35M basis. The impairment is $0–17.5M, so proceeds are 0.50–1.00x of basis. It is bounded, it caps the downside, and it frees capital with no execution risk. In gateway markets where land scarcity supports a floor, the land sale can print well above the Sun Belt range; in distressed submarkets where office is the residual use, it prints closer to it.

Table 4: The three paths side by side on the same physical asset, all inputs illustrative. No path clears the 1.15x screen at a $100 PSF basis. Path A fails because the Sun Belt Class A-minus rent lift is too narrow to carry the capex; Path B fails without subsidy and remains below 1.0x with a 25% stack; Path C returns 0.50–1.00x of basis with no further capital. The result is specific to this asset's submarket: at a post-repo rent of roughly $39 PSF, the Path A inputs above reach 1.20x, which means a stronger CBD where Class A-minus leases near the Class A band.

Sensitivity

The Path A reposition is the closest of the two build paths to recovering its cost, which makes it the path most sensitive to its underwriting inputs. The basis and exit cap are the two variables that move the value-on-cost most.

Table 5: Path A value-on-cost sensitivity to basis and exit cap, with $75 PSF of capex, $4.59M of stabilized NOI, and total cost equal to basis plus $26.25M. Only the $75 PSF basis at the base cap reaches 1.0x (1.03x), and no cell reaches the 1.15x screen. The basis is the input the institutional acquirer can negotiate; the exit cap is the input the market dictates. Discipline says price the basis to clear 1.15x at a stressed exit cap, and in this submarket that basis is below the working range.

Trophy Upside and the Gateway Exception

Not all office is broken. In 2026 the trophy and well-located Class A cohort is where leasing demand has concentrated. Deloitte signed a lease for about 800,000 SF at 70 Hudson Yards, nearly three-quarters of a more-than-60-story tower, before construction began (per CRE Daily, with construction slated to start in June 2025). That is a 2025 pre-lease on a tower that was not yet built, not an operating-building print, but it is the largest ground-up office start in the US since the pandemic according to the same report. The Comptroller's occupancy figures show the same concentration at the high end: 5-star buildings, about 10% of Manhattan office space, absorbed almost all of the improvement.

Table 6: Selected Manhattan trophy leasing prints. Sources: The Real Deal (9 West 57th, One Vanderbilt, 605 Third Avenue) and CRE Daily (70 Hudson Yards). Rents above $300 PSF remain extremely rare, but per The Real Deal New York recorded 313 leases at $100 PSF or more in 2025, against 212 in 2024.

The pattern across the sourced prints is the same one the Comptroller's data shows: demand concentrates in the top tier while the contested middle has to earn its rent. A sponsor underwriting a Class A-minus reposition is competing for the occupiers that cannot or will not pay for the trophy tier, and the basis-plus-capex hurdle gets harder to clear the further the post-repo rent sits from the trophy comps.

The No-Path Asset and the Workout Cohort

Not every Class B has a reposition or conversion path. The floor plate fails the conversion screen, the submarket fails the reposition rent test, the basis is too high to absorb the impairment, or the debt traps the equity. Per Trepp, as reported by The Real Deal, the nationwide CMBS office delinquency rate hit a record 12.34% in January 2026, driven by two very large loans backing New York office buildings, Worldwide Plaza and One New York Plaza. None of the workout paths preserves the original underwritten IRR; all are common in the 2026 cohort.

From the Stratification Call to the Underwrite

The 2026 office acquirer's underwriting discipline. The stratification call is the first decision in the workflow; every subsequent input ranges around the answer. The institutional sequence:

1. Read the asset against the four tiers, then validate against the submarket. Trophy / Class A / Class A-minus / Class B is relative, not absolute. A Class B in downtown Tampa and a Class B in downtown SF are different underwrites because the comp set is different.

2. Anchor the rent uplift on the Class A-minus comp set, not the trophy or Class A comp set.The biggest discipline failure in reposition underwriting is over-shooting the rent line by comping against the wrong tier.

3. Stress the exit cap by +100 bps for Class A-minus reposition, +200 bps for conversion. The Class A-minus exit is structurally less liquid than Class A; the conversion exit carries a residual structural-conversion discount the multifamily acquirer will demand.

4. Underwrite lease-up downtime explicitly. This article's working assumption is 24–36 months from substantial completion to stabilized occupancy, with free rent, TI, and leasing commissions sized from the submarket's Class A-minus comps (seeOffice Underwriting: TI, LC, Free Rent, and Effective Rent).

5. Require basis-plus-capex to clear at the stress exit. A reposition that clears at the underwritten exit but fails at the stress exit is not institutionally underwriteable.

6. Require debt to survive lease-up downtime. Bridge debt for an office reposition carries floating rates and rate-cap renewal exposure (seeBridge Loans: Floating-Rate Risk).

7. For conversion plays, quantify and time-bound the subsidy stack. The deal can't rely on subsidy that hasn't been awarded. Size as-of with and without; sponsor should be willing to walk if the subsidy is not delivered.

The IRR machinery for the stabilized NOI isIRR Sensitivity Analysis and Stress Testing; the OpEx and lease structure detail sits inOffice Underwriting: TI, LC, Free Rent, and Effective Rentand Office Lease Analysis: Gross vs NNN, Expense Stops; the submarket sublease-overhang framing sits inOffice Market Analysis: Sublease Overhang and Hybrid Work. The value-add multifamily analog isValue-Add Multifamily: Renovation Premium Modeling.

Six Mistakes 2026 Office Underwriters Make

• Underwriting the reposition rent against the trophy or Class A comp set, not Class A-minus.The most common single error. A repositioned Class B is a Class A-minus product; pricing it against the full Class A or trophy comp set inflates underwritten rent and breaks the lease-up defensibility. In the worked example, pricing $48 PSF instead of $34 PSF adds $4.41M of NOI (96% of the correct $4.59M) and $51.9M of apparent value at an 8.5% cap. Validate against three to five Class A-minus deals in the same submarket signed within the trailing 12 months.

• Treating lease-up as a 12-month event. A 12-month lease-up on a reposition assumes a speed this article's 24–36 month working range does not support. Concession-burn is non-negotiable; broker LC and TI dollars are paid in cash.

• Missing the property tax reassessment. A reposition that materially lifts asset value will reassess in most jurisdictions on sale or substantial improvement. In the worked example the step-up is $1.0M a year, and holding taxes at the pre-repo level overstates stabilized NOI by about 22% ($1.0M on $4.59M).

• Anchoring conversion math on a single cost-per-SF figure without sizing the line items.Conversion cost is asset-specific and MEP-heavy; Brookings found the lowest recent conversion cost at $145 PSF against average hard costs above $300 PSF in every one of its markets except Houston. Size the line items, then validate against published ranges.

• Underwriting conversion without quantifying the subsidy stack. Brookings found no economically viable conversion without policy intervention in five of its six markets. Size the credit, the abatement, the deferred-tax PV, and time-bound the receipt; if timing risk is meaningful, haircut the nominal value of the stack for it.

• Holding the no-path asset too long. The workout cohort's worst outcome is the asset that bleeds operating cash for three years before the path-C sale or deed-in-lieu. Make the path call at acquisition and again at month 12 of execution; capital is better redeployed than waited.

Do It in Apers

The 2026 acquirer pulling an OM on a 350,000 SF Sun Belt CBD Class B asset has two natural entry points into the Apers marketplace, sized to two distinct underwriting moments.

AQ-200 Pocket: Office Lease Rollover is the screening pass. The acquirer scanning a fresh OM at 11pm wants to know whether the in-place rent roll rolls off in a way that makes the reposition thesis viable, or whether a 70% rollover in years 1–2 destroys the lease-up math before the reposition starts. AQ-200 takes the rent roll and lease abstract and produces the rollover schedule, the weighted-average lease term, the credit-tenant exposure, and the free-rent and concession overhang.

AQ-201 Office Full-Service Lease Rollover Model is the integrated underwrite for the Path A reposition (Class B → Class A-minus). Detailed monthly cash flow up to 50 tenants over a 120-month horizon, full-service gross (FSG) lease economics with TI/LC packages and free rent, and probability-weighted or binary rollover logic toggling between blended retention and explicit per-tenant renew/vacate. The Path A inputs in this article (the rent roll rollover schedule plus reposition capex by line) are the ones that drive the stabilized NOI bridge and the exit-cap sensitivity in the model.

DV-002 Redevelopment / Adaptive Reuse Model is the integrated underwrite for the Path B office-to-residential conversion path. Merchant-build pro forma for converting an existing building to a new use, with monthly construction draws, capitalized interest reserve, and exit at stabilization. The Path B 400-unit conversion in the worked example uses the same inputs the model asks for: the conversion cost stack, construction-period interest reserve, lease-up curve, and the residential exit-cap arithmetic.

Related Articles

• Office Underwriting: TI, LC, Free Rent, and Effective Rent: the lease-economics building block that drives the post-repo effective rent on every Class A-minus anchor lease.

• Office Lease Analysis: Gross vs NNN, Expense Stops, and the OpEx Pass-Through: the OpEx-pass-through architecture that determines the net rent on a Class A-minus deal and the sponsor's exposure to property-tax reassessment.

• Office Market Analysis: Sublease Overhang and the Hybrid-Work Demand Curve: the submarket-level demand framing that underpins the stratification spread and the lease-up defensibility for the Class A-minus reposition.

• Value-Add Multifamily: Renovation Premium Modeling for the 2026 Vintage: the multifamily analog for the same reposition-math discipline.

• IRR Sensitivity Analysis and Stress Testing: the returns machinery that converts the stabilized NOI into a levered IRR and stress-tests it against the exit-cap and lease-up assumptions.

• Bridge Loans: Floating-Rate Risk, Rate Caps, and the 2026 Exit Assumption: the debt-side architecture for the office reposition bridge and the rate-cap renewal exposure that sized lease-up downtime amplifies.