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The Rent You Assume Is Market Rate but Nobody Around Has Paid in Years A four-unit building trades in East Nashville, and the numbers look fine on paper...
A four-unit building trades in East Nashville, and the numbers look fine on paper because the seller listed each unit at $1,650. The buyer runs the pro forma against that figure, the deal pencils, everyone shakes hands. Then the first lease turns over and the new tenant pool tops out around $1,400.
That gap is where a lot of otherwise smart investors lose a year of returns.
The rent you write into your model is the single biggest lever in the whole deal. Get it 15 percent too high and the cap rate you thought you were buying doesn't exist. So it's worth understanding how "market rate" gets stale in the first place, and how to check it before you sign.
Rent rolls tell you what tenants are paying, not what tenants will pay. Those are different questions, and the difference grows every year a lease sits in place.
A tenant who signed in 2021 and renewed twice on modest bumps is paying a 2021 number with a little padding on top. If the neighborhood cooled, softened, or just leveled off since then, that padded number can now sit above what a new lease would actually command. The rent roll looks healthy right up until the unit vacates.
Sellers know this, which is why some prefer to sell with long-tenured tenants in place. The in-place rent props up the asking price even when the achievable rent has drifted the other direction.
The other version of the fossil is neighborhood folklore. Someone in your circle bought near Riverside Village three years ago, quoted their rent at a barbecue, and that figure lodged in everyone's head as the going rate.
Neighborhoods move faster than that story does. A pocket that was underpriced in 2023 may have caught up and plateaued, while a corridor everyone assumed was flat quietly climbed as new retail opened nearby. The number people repeat is almost always the number from the last time they personally touched a lease, not today's.
Wedgewood-Houston, parts of Germantown, the stretches around the Nations, these areas have all had periods where the assumed rent and the leasable rent parted ways for a stretch. Assuming continuity is the easy mistake.
Pull active listings first, but read them carefully. A unit listed for 45 days at $1,800 is not a $1,800 comp. It's evidence that $1,800 hasn't cleared.
The rent that leases in a week or two is your real ceiling.
Then look at what recently rented and came off the market. Days-on-market is the tell. Fast lease-up means the price was at or below market; a listing that lingered and then dropped shows you where demand actually sat.
Weight your comps by similarity that a renter would notice: same submarket, comparable finishes, in-unit laundry or not, parking or street, square footage within reason. A renovated two-bedroom in Inglewood and a dated one across the river are not the same product, and averaging them buries the answer.
Rental demand in Nashville isn't flat across the calendar. The heaviest leasing traffic runs late spring through summer, when relocations, job starts, and lease cycles all bunch up. A unit priced aggressively in June has a deep pool to draw from.
That same unit hitting the market in November draws a thinner crowd. Fewer people move in cold weather, so a rent that would have leased in ten days in July can sit into the new year. If you're underwriting a deal closing this fall, model the vacancy honestly for the season you're actually leasing into, not the summer peak.
None of this means a fall purchase is a worse purchase. It means your first lease-up timeline and your rent assumption should reflect the calendar in front of you, not a rosier one.
Underwriting to the achievable rent instead of the aspirational one doesn't kill deals. It kills bad ones and protects the good ones.
When you model the rent a new tenant will pay in the current season, a few things fall into place. Your cap rate is real. Your debt coverage holds even if the first unit takes a few extra weeks.
And you stop paying today for rent growth you're hoping happens later.
There's also upside in the gap itself. A building carrying below-market in-place rents, where the tenants are genuinely under the current rate, is a value-add story you can execute on turnover. That's a very different thing from a building where the seller pushed asking rents no one has paid.
Telling those two situations apart is the whole game, and it's hard to do from a spreadsheet alone because it takes local, current knowledge of what leases and what doesn't by submarket. This is the kind of gut-check work we do at Arrt of Real Estate before a client commits to a rental number, because the rent assumption drives everything downstream.
A useful read pulls recent leased comps, weights them for actual comparability, flags any in-place rents that look stretched, and separates the vacancy risk that's seasonal from the risk that's structural. You want to walk into the deal knowing which units are under-rented, which are over-rented, and what a realistic new lease clears at today.
The rent you assume is a decision, whether you treat it like one or not. Give it the same scrutiny you'd give the purchase price, because on a rental, they're the same conversation.