My GC said the floor plate kills more deals than the financing does and I cannot stop turning that over

Your GC is describing something the strategy guide puts plainly: not every building converts well, and office floor plates are one of the primary reasons. The guide specifically calls out floor plate geometry, window placement, and plumbing layouts as the variables that determine whether a conversion can work at all, before financing enters the picture.

Here is what the 62-foot depth number means for anyone reading this who has not held a tape measure in an office building. Residential building codes in most jurisdictions require that habitable rooms, meaning bedrooms and living areas, receive natural light from a window. A typical apartment needs roughly 20 to 30 feet of building depth to make that work with a standard double-loaded corridor (one hallway with apartments on both sides). At 62 feet from glass to core, you are left with a dark interior band that cannot legally or practically become living space. You can chase it with atriums, light wells, or unit configurations that wrap the core, but each solution adds cost and eats rentable area, which is the square footage you can actually charge rent on. When rentable area shrinks and cost climbs, the spread between what the building is worth acquired and what it costs to convert it can disappear entirely.

The thing worth sitting with, and I say this as someone who explains how things work rather than as someone who has underwritten a deal, is that the guide frames feasibility discipline as the core institutional skill here, because construction cost can rival ground-up building on a problem floor plate. A sponsor who prices the acquisition off a rent roll before a conversion architect has walked the building is underwriting a different asset than the one they are buying.

What role are you typically in when you are walking these buildings? That would help me point you toward the part of the guide most useful to where you sit.

The 62-foot depth number is the one I keep coming back to. I did a gut rehab on a converted textile building in Richmond a couple years ago, smaller scale, but even at 18,000 sf per floor we were fighting a 48-foot interior span and I was pulling light wells that cost me $340 a square foot to frame correctly just to get code-minimum egress light into the middle units. And that was a building where the bones were already broken up by old load-bearing party walls that gave us natural unit separations. A clean open plate at 62 feet with a central core is a different animal entirely, because you do not have those accidents of history working for you. The developers I have watched try to solve it with double-loaded corridors end up with interior bedrooms that appraisers just do not know what to do with. Financing was always the story they told the room but the yield-on-cost math was already dead the day somebody drew that core location on a napkin forty years ago.

The thing I have never seen work is underwriting the light problem away with a courtyard cut after the fact. On paper it looks like a solution, you lose maybe 8,000 sf per floor and call the units "loft-style," but the structural cost to open that atrium on a poured concrete building runs $400 to $600 a sf of cut, and by the time you are done you have destroyed the unit count that justified the land basis in the first place.

The deals that actually close on floor plates like that are the ones where somebody with a tape measure killed 40 units in the proforma before the LOI went out, not after.