Pricing the gap to replacement cost as downside protection deserves more scrutiny than it usually gets
Operators who come from the build side tend to trust replacement cost more than any other number in the model, which is exactly the bias worth checking hardest. Consider a 312-unit garden deal, 2004 vintage, in a second ring suburban submarket with employment inside four miles, priced around 181,000 dollars a door. A builder's own cost stack to put the same thing up today might run 258,000 dollars all in, even before fighting for land, with hard costs up close to 39 percent from 2020 on recent bids. That gap between acquisition basis and replacement cost is doing two jobs in most underwriting. First, it caps competitive new supply, since nobody breaks ground at a sub-5 untrended yield on cost when the resale comp sits at 181,000. Second, it supplies an exit story, since a future buyer will compare the asset to whatever it costs to build at that time. The first job is a forecast dressed as a fact. Hard costs are not a floor. If labor loosens and materials come off 8 to 10 percent while land sellers finally capitulate, that 258,000 dollar replacement number narrows meaningfully without rents moving at all. The second job only pays off if the next buyer actually weights the cost approach, and on stabilized apartments almost none do. The honest way to treat a replacement cost gap is as a real but soft input, worth translating into years of supply protection or basis points of exit cap where the data supports it, and worth naming clearly as assumption rather than fact in any investment memo, rather than letting it quietly make a thin deal feel thicker than it is.
In institutional apartment underwriting, what work does buying below replacement cost actually do?
14 votes