The acquisition is the easy part. Every value-add business plan lives or dies on the day it has to refinance.

Most value-add plans have the same three acts: buy with short-term money, renovate and lease up, then refinance into long-term agency debt. The first act gets all the attention in the pitch. The third act is where the plans break.

A bridge loan is simple money at a hard price. Right now that means roughly 9 to 11 percent, interest only, for 12 to 24 months with extension options. Everyone underwrites that part honestly, because the payment shows up on day one. The refi, three to five years out, gets underwritten with hope.

Here is the part that deserves more respect: at refinance, the lender becomes the underwriter of your business plan. Agency lenders like Fannie Mae and Freddie Mac want to see a debt service coverage ratio of roughly 1.20x to 1.25x and will lend 75 to 80 percent of value. Those two numbers together set the maximum loan you can take out. Not the value you underwrote. The payment the property can carry.

This is the math that kills deals. You borrow at 9.5 percent bridge expecting to refi at, say, 6.5 percent. If rates are still elevated when year three arrives, the debt service on 75 percent leverage produces a coverage ratio no agency lender will touch — or the loan that fits a 1.25x DSCR is smaller than the bridge balance you need to pay off. That gap comes out of pocket. It is a capital call by another name.

So underwrite the refi first. Run the stabilized net operating income at a 1.25x coverage ratio using a rate 100 to 200 basis points above today's agency quotes. That is the loan you can count on. Now size everything else backward from that number: the bridge loan has to be payable from those proceeds, and the renovation budget has to produce enough NOI to carry the payment at that stressed rate.

Then price the cost of being wrong. Extensions on bridge debt typically run 6 to 12 months each, with fees each time — and every extra month at bridge rates is real carry. On a $10 million loan at 10 percent interest only, that is roughly $83,000 a month. If your plan needs two extensions to work, it does not work.

The discipline is simple: never let the exit financing be the optimistic line in the model. Stress the rate, stress the coverage ratio, stress the timeline — and make sure the deal still pays off its debt with margin to spare. If it cannot, the deal is not a deal. It is a bet on rates.

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