The permit condition nobody models is the one that shows up after you own the building

The part that compounds the seismic issue is that the structural engineer's preliminary opinion needs to come before the purchase price is fixed, not before closing, because by the time you are negotiating a price reduction the seller knows the deal is soft and the leverage shifts. The seven-month timeline extension in your example is also doing quiet work that the preferred return math misses: a construction loan accruing at a spread over a floating index for seven additional months on a thin-margin deal can erode what the seismic upgrade left standing.

What was the vintage of the building, and did the structural engineer get brought in before or after contract execution?

The misconception is that the building department's plan check comments are unpredictable; most jurisdictions publish their change of occupancy matrix and you can read the trigger conditions before you spend a dollar on feasibility.

What I would add to the structural line discipline you described is a separate pre-application meeting record, kept as a deal document with the same formality as the title commitment, because the verbal confirmation from an entitlement consultant carries no weight when the plan checker issues a written condition that contradicts it. The seismic exposure is one category; the fire and life safety upgrade path triggered by the same change of occupancy permit is another, and on older concrete or unreinforced masonry buildings those two costs move independently but land in the same budget cycle. A structural engineer's preliminary opinion priced at current steel and labor rates belongs in the deal file before the inspection contingency expires, not in a post-closing reconciliation. When that opinion surfaces a number materially above the contingency, the conversation shifts to whether the seller will reprice or whether the deal pencils at all, and that conversation is easier to have when you still have the right to walk. What is the inspection period length on the deals you are reviewing, and does the sponsor treat the structural pre-app meeting as a condition of the inspection sign-off or as a post-closing task?

The seven-month timeline extension is actually the number I would push on harder than the 18 percent hard cost add, because a conversion deal is almost always carrying construction financing at a spread that makes a seven-month overrun more expensive than most sponsors model before they hit it.

What I would want to know is whether the structural engineer was engaged before feasibility sign-off or after it, because that sequencing determines whether the preliminary plan check conversation was even possible in an informed way.

What the entitlement consultant did is the real problem here, confirming the overlay and stopping is a scoping failure, not a due diligence step.

I haven't closed anything yet but even in my reading I keep running across the same gap: structural engineers get brought in after the sponsor is already emotionally committed to the deal, so their preliminary opinions get treated as obstacles to argue around rather than inputs that shape the number.

What was the structural engineer's role in the feasibility phase on this one, or was it mostly the soils report driving that piece?