An investment property is advertised with a compelling cap rate. Then you review the income and expenses and discover that the advertised figure depends on rents the building does not yet collect.
*By NYC Exclusive Apartments*
The opportunity might be real. But the higher return still requires a plan.
**When comparing current cap rate vs. pro forma cap rate, identify the additional net operating income the projection requires, then verify its source, timing, legal basis, and cost.** A future income estimate deserves a different level of confidence from documented operating results.
For a NYC multifamily buyer, the central question is straightforward: **What must happen between buying the building and earning the advertised income?**
> Start with the formula—and identify the income behind it
For the acquisition comparison used here:
**Cap rate = annual net operating income ÷ purchase price.**
NYC Housing Preservation and Development uses the same income-to-sales-price relationship in its explanation of capitalization rates. [HPD]
**Net operating income**, or **NOI**, is property income after operating expenses. It is calculated before mortgage principal and interest, owner income taxes, and depreciation. Major capital expenditures are treated separately from ordinary operating costs; reserve deductions can vary by underwriting convention. [occ.treas.gov]
A cap rate therefore does not tell you your cash-on-cash return, financing cost, total project funding requirement, or eventual resale profit.
It answers a narrower question: how does the specified annual operating income compare with the specified property price?
“Current” needs a definition
A current cap rate might use:
– **Trailing-12-month results:** Income and expenses over the previous year.
– **Annualized in-place operations:** Current rents and expenses extended over a year.
– **Adjusted current NOI:** Present operations with explicitly identified corrections or normalizations.
Those approaches can produce different answers. Ask for the reporting period and every adjustment.
“Pro forma” describes assumptions
A pro forma is a financial projection. It might model the next year or a later period when renovations, leasing, or operating changes are expected to be complete.
That later condition is often called **stabilized operations**.
A projection can be useful. Its usefulness depends on the evidence behind the assumptions and the resources required to execute them.
A hypothetical NYC example: 5% today, 6.5% projected
Assume a rental building has an asking price of **$3 million**. The following figures are invented solely to demonstrate the analysis; they do not describe a listing or current NYC market averages.
Both columns use annual amounts and a consistent expense classification.
| Income or expense | Illustrative current case | Projected stabilized case |
|—|—:|—:|
| Gross scheduled rental income | $360,000 | $420,000 |
| Less vacancy and collection losses | ($18,000) | ($21,000) |
| Other recurring income | $6,000 | $6,000 |
| **Effective gross income** | **$348,000** | **$405,000** |
| Operating expenses | ($198,000) | ($210,000) |
| **Net operating income** | **$150,000** | **$195,000** |
| **NOI ÷ $3 million price** | **5.0%** | **6.5%** |
*Operating expenses include property taxes, insurance, management, utilities, and routine maintenance. Debt service, capital improvements, replacement-reserve contributions, acquisition costs, and owner income taxes are excluded from this illustration. Lender calculations may classify reserves differently.*
The higher cap rate requires **$45,000 in additional annual NOI**.
Here is the reconciliation:
– **$60,000 more scheduled rental income**
– **Minus $3,000 in additional vacancy and collection losses**
– **Minus $12,000 in additional operating expenses**
– **Equals $45,000 in additional NOI**
The projected 6.5% cap rate is the outcome of those assumptions. The buyer’s task is to test them.
Where will the additional rent actually come from?
A useful projection assigns each increase to a particular unit, lease, or operating change.
Possible sources include leasing a vacant apartment, completing a documented renovation, or implementing a lawful increase when permitted. Each involves different evidence and timing.
In the hypothetical example, if the entire $60,000 gross rental increase were assigned to **four apartments**, the plan would require an average increase of **$1,250 per apartment per month**.
That calculation does not establish that the increase is lawful or achievable. It translates an abstract annual projection into a concrete assumption to investigate.
For each proposed increase, request:
– The current lease, rent, expiration date, and collection history.
– The proposed rent and relevant comparable rentals.
– The legal basis and earliest realistic date for the change.
– Any renovation, approval, or leasing work required.
– Expected downtime and associated costs.
A spreadsheet can assign a new rent immediately. The property must earn it under actual conditions.
NYC rental rules can change the projection
Rent-regulated and other protected tenancies require careful review before projected increases enter a purchase budget.
For rent-stabilized tenants paying a preferential rent on or after June 14, 2019, New York State Homes and Community Renewal explains that the preferential rent generally continues for the life of the tenancy, with lawful increases applied to it. Certain government-regulated affordable housing programs can have different rules. [Homes and Community Renewal]
A higher registered legal rent therefore should not automatically be substituted for the rent collectible from the existing tenant.
Other apartments may be subject to **Good Cause Eviction** protections. NYC HPD explains that coverage can affect lease nonrenewals and challenges to certain rent increases, with exemptions and case-specific considerations. [nyc.gov]
Have a New York landlord-tenant attorney review regulatory status, leases, rent histories, applicable agreements, and the proposed business plan.
**A lease expiration is not proof of future vacancy.** Projected income should respect existing tenancy rights and avoid assuming turnover that has no documented basis.
Scheduled rent is not the same as collected income
A rent roll identifies rents assigned to apartments. It does not, by itself, establish what has been received.
Reconcile the rent roll with tenant ledgers, operating statements, and appropriately documented collections. Investigate arrears, concessions, unusual receipts, and differences between reporting periods.
Fannie Mae’s multifamily guidance calls for validating lease terms against the rent roll and reviewing support for collections and secondary income. That is a useful discipline for buyers, regardless of the eventual financing source. [Fannie Mae Multifamily Guide]
Also distinguish **physical occupancy** from **economic performance**. An occupied unit can produce less cash than its scheduled rent suggests.
The pro forma should explain both occupancy and collectible income.
Expense assumptions deserve the same scrutiny as rents
A projection can overstate NOI through optimistic expenses as easily as through optimistic rents.
Review insurance, property taxes, utilities, management, repairs, payroll or contracted services, and recurring compliance expenses. Obtain current documents and quotes where appropriate.
Watch for an owner’s unpaid labor disappearing from the expense budget without any allowance for replacement management or maintenance.
Separate ordinary repairs from major capital work. Removing a roof replacement from recurring operating expenses may be appropriate, but the replacement still needs funding.
The OCC’s commercial real estate lending guidance distinguishes operating costs from capital items and emphasizes stabilized income analysis. It also recognizes that underwriting conventions may include replacement reserves. [occ.treas.gov]
In the example, the projected operating expenses already rise by $12,000. If they rise more, less of the proposed rent increase reaches NOI.
The pro forma also needs a timeline and funding plan
A stabilized year is not necessarily your first year of ownership.
If improvements take months to complete, the buyer may face construction expenses, vacancy, leasing costs, and carrying obligations before the projected income arrives.
Request a month-by-month transition budget, including:
– Work scope, contractor pricing, and contingency.
– Permits or professional approvals where required.
– Expected leasing dates and concessions.
– Debt service and property expenses during the transition.
– Additional cash needed if completion or leasing takes longer.
The acquisition cap rate’s purchase-price denominator does not automatically include renovation and closing costs. Evaluate returns on **total project cost** separately, and calculate investor cash flow after financing and required expenditures.
Ask the lender which income assumptions it will accept. A seller’s projected NOI does not establish your available loan proceeds.
Syd’s Field Note: check the definition when using city data
**Source-based practical insight:** NYC Department of Finance states that property taxes are omitted from operating expenses for its assessment purposes. [nyc.gov]
An investor’s acquisition budget ordinarily needs to account for property taxes.
Before transferring an NOI figure from assessment material into a purchase analysis, identify how it was calculated and reconcile the differences. The same label can conceal a materially different expense treatment.
This is one reason a document’s source matters as much as its headline number.
Five steps before relying on a pro forma cap rate
1. **Rebuild the current case.** Establish the reporting period, reconcile collections, and document every adjustment.
2. **Translate the upside into dollars.** Show the change in rental income, other income, losses, and expenses.
3. **Validate each material assumption.** Confirm lease terms, applicable rental rules, comparable rents, work requirements, and costs.
4. **Model the transition and downside.** Test slower leasing, lower achievable rents, higher expenses, and additional capital needs.
5. **Align the price and financing with the evidence.** Decide whether the purchase works if only part of the projected improvement occurs.
A credible pro forma explains how the building could improve. A sound acquisition plan also explains how you will fund that improvement and manage the risks along the way.
If you are evaluating a NYC multifamily or mixed-use purchase, contact **Sydney Harewood** to discuss your search and organize the property questions to review with your lender, attorney, accountant, and inspection professionals.
**Sydney Harewood**
Licensed Real Estate Salesperson · FIND Real Estate
[646-535-3819](tel:6465353819) · [[email protected]]
[NYC Exclusive Apartments]
*Your Premier Bridge to Manhattan Living & Wealth.*
Sources and further reading
Sources reviewed October 30, 2026.
– [NYC HPD: Speculation Watch List] — includes its capitalization-rate definition.
– [Office of the Comptroller of the Currency: Commercial Real Estate Lending] — income analysis, valuation, and NOI definitions.
– [NYS Homes and Community Renewal: Leases and Preferential Rents].
– [NYC HPD: Good Cause Eviction].
– [Fannie Mae Multifamily Guide: Validating Rent Collections, Bad Debt, and Secondary Income].
– [NYC Department of Finance: Definitions of Property Assessment Terms].
*General investor education, not individualized investment, lending, legal, or tax advice. All property figures are hypothetical. Verify income, expenses, tenancy rights, physical condition, financing, and project costs before committing to a purchase.*
We hope you found this information helpful. If you have any other questions or need more details, feel free to contact us.
