Exit Cap Rate Assumptions: Why Most Sponsors Get This Wrong

The exit cap rate is the single most consequential assumption in a real estate underwriting model — and it is the one that sponsors most frequently get wrong. A 25 basis point change in exit cap rate on a $50M asset swings the exit value by approximately $1.5-2M, which can move an IRR by 150-200 basis points. Despite this sensitivity, exit cap rate assumptions are often selected with surprisingly little rigor.

The most common error is mechanical: sponsors take their going-in cap rate and add a fixed spread — typically 10-25 basis points — and call it their exit cap. This approach assumes that cap rate movement is linear and predictable, which it is not. Cap rates are a function of interest rates, capital flows, property condition, and market fundamentals at the time of sale. None of these variables can be predicted with precision five to seven years forward.

A more defensible approach starts with the long-term average cap rate for the asset class and submarket. If the 20-year average cap rate for Class B multifamily in a given MSA is 5.75%, and your going-in cap is 5.25%, then a 5.50-5.75% exit cap is a reasonable base case. This approach acknowledges the cyclicality of cap rates and avoids the trap of projecting from a cyclical low.

The relationship between the going-in cap rate and the exit cap rate should also reflect the business plan. A value-add deal that significantly improves the physical condition, tenant quality, and NOI profile of an asset may warrant a tighter exit cap than the going-in cap — the property is genuinely better at exit than at acquisition. A stabilized asset with limited upside should, by contrast, assume cap rate expansion simply to account for the aging of the property and the passage of time.

Lenders are particularly focused on exit cap rate assumptions because they directly govern refinance and repayment risk. A deal that requires a sub-5% exit cap to generate a 1.0x equity multiple is, in a lender's eyes, a deal that may not be able to repay its debt at maturity if cap rates expand. This is the kind of structural risk that results in lower proceeds, higher reserves, or a declined application.

Sensitivity analysis is essential. Every underwriting should show how returns change across a range of exit cap rates — typically 50-75 basis points above and below the base case. If a deal only works at one specific exit cap rate, it is not a deal — it is a bet. Institutional capital sources expect to see this analysis, and its absence signals a lack of sophistication in the underwriting.

We recommend that sponsors present exit cap assumptions as a range, not a point estimate, and clearly document the rationale for the base case selection. Reference long-term averages, comparable sales, and third-party forecasts. Acknowledge uncertainty explicitly — lenders and investors respect intellectual honesty more than false precision.

When we place debt for a deal, the exit cap assumption is one of the first things lenders evaluate. A well-documented, conservatively stated exit cap rate gives lenders confidence in the sponsor's judgment and increases the likelihood of favorable terms. This is one of the many areas where the quality of the underwriting directly impacts the quality of the capital placement.