Every building I have ever looked at works on a spreadsheet. The spreadsheet is not the deal. The deal is the plan: what you are going to change, what it costs, how long it takes, and what happens when it takes longer than you said it would. I have watched smart people fall in love with a building and stop reading at the pro forma. The pro forma is a prediction about the building. The prediction that matters is about the plan.
Most underwriting starts with the building: the rents, the expenses, the cap rate. That is the wrong starting point. The building is a snapshot. The plan is the movie. Two identical buildings get two different returns because two different plans are running them. One owner renovates in the wrong order for two years and leases into a soft market. The other sequences the work floor by floor and never loses occupancy momentum. Same building, same market, different plan, different outcome.
A business plan is really just a short list of promises. Raise rents to a certain level. Renovate a set number of units at a certain cost each. Cut expenses by a certain amount. Lease up in a certain number of months. I write them down as promises, because each one has to survive contact with the actual building, the actual tenants, and the actual city. Every promise needs an owner, a cost, and a deadline. If a line on the plan does not have all three, it is not a plan. It is a hope.
The test I run on every plan is simple: take each promise and ask what breaks first. Renovations run long, so what does month nine look like if the units are not back online by month six? Rents stall, so what happens if the rent bump lands at half the target? A contractor walks, so who finishes the work and at what price? If the answer to any of those is that you are underwater, the plan was never underwritten. It was wished. The plans that hold up are the ones that still pencil when the two most optimistic assumptions get cut in half.
Where plans actually die is almost always the timeline. Contractors run late, permits move slower than the schedule assumes, tenants do not move on your calendar, and inspections arrive when they arrive. The plans that perform build the slowness in up front: an extra quarter of carrying cost, a contingency on every renovation line, a leasing assumption that does the market no favors. That is not pessimism. It is pricing reality before reality prices it for you, at a much worse rate, in month eight when the money is already committed.
The second killer is the plan asking the team to do something they have never done. A garden-style operator taking over a mid-rise with elevators. A market-rate team managing regulated units. A group that has never run a gut renovation promising twenty of them in eighteen months. The plan assumed the capability, and nobody verified it. I underwrite the operator the same way I underwrite the plan, by checking whether the track record matches the promises. The right team on a mediocre plan beats the wrong team on a great one, every time.
So I keep a one-page version of every plan where I can see it: the five promises, the three ways each one can break, and the carrying cost of being wrong. If the returns still work when I am wrong on two of them, the deal is real. If they only work when everything goes right, the deal is a lottery ticket with better branding. The building just tells you what you are starting with. The plan tells you what you will end up with. Underwrite accordingly.
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