We Published a Four-Checkpoint STR Framework for Nashville Investors - Here's What's in It

On March 19, 2026, The Costigan Group released a structured pre-acquisition framework for Nashville STR investors. The release was distributed via GlobeNewswire and picked up by Yahoo Finance. You can read the original here: The Costigan Group at Compass Releases Data-Driven STR Framework for Nashville Investment Property Buyers

This post goes deeper on what the framework actually contains and why we built it the way we did.

Why We Formalized the Framework Now

Nashville's STR market has been narrowing. Occupancy rates across the most active rental corridors have normalized in the low-to-mid 50s. Average daily rates are down 15 to 25 percent from post-COVID peaks. Properties purchased without conservative underwriting are now running monthly cash flow gaps that first-time investors did not see coming.

The framework is not new. We have been running every acquisition through these checkpoints for the last two years. What changed is the market condition around us. When margins were wide, a good property in the right neighborhood covered a lot of mistakes. That environment is gone.

What remains is the quality of the analysis going into the purchase. That is where deals get won or lost now.

If you want the broader context on how we approach STR advisory in Nashville, start here: Short-Term Rental Advisory.

Checkpoint One: Zoning Verification

This is the first thing we check, every time, without exception.

Nashville uses a two-tier permit system. Owner-occupied STRs operate under Type 1 permits. Non-owner-occupied STRs, which covers virtually all investor-purchased properties, require Type 2 permits. Type 2 permits are restricted to commercial and mixed-use zoning districts.

The practical implication: two properties on the same street with identical asking prices can have completely different investment viability based solely on their zoning designation. One is eligible for a non-owner-occupied STR permit. The other is not. No amount of revenue optimization or interior design changes that.

We verify zoning through Metro Nashville's parcel viewer and planning department records before a client ever tours a property. Emotional commitment builds fast in real estate. If you fall in love with a property before you know it is ineligible for the permit you need, the decision you face at diligence is a harder one. We remove that problem at the front of the process.

"Most investors discover zoning issues after they have already committed emotionally to a property. We reverse that sequence. Zoning comes first, and then we evaluate performance potential within the pool of eligible properties." — Jack Costigan

Checkpoint Two: Layout Analysis

Within the eligible pool, not all properties perform equally. Layout determines guest experience, and guest experience determines review scores, and review scores determine both occupancy and rate potential.

We evaluate bedroom count, bathroom ratios, parking availability, and outdoor space relative to guest expectations at each price tier. A two-bedroom property with one bathroom in a submarket where competing inventory runs two bedrooms and two baths is already behind before the first guest books. A property with no dedicated parking in a neighborhood where street parking is unreliable will generate specific, recurring complaints that suppress ratings.

These are not cosmetic issues. They are structural performance constraints. We identify them before the offer.

Checkpoint Three: Block-by-Block Competitive Positioning

Market-level data tells you about Nashville's STR market. Block-level data tells you about the specific property you are evaluating.

We examine proximity to Nashville's primary demand drivers, walkability scores, and competitive density within a quarter-mile radius. A property two blocks from a venue that generates consistent weekend demand performs differently than an otherwise identical property six blocks away. A corridor saturated with STR inventory competes on price in ways that thin margins further. A corridor with limited supply has more pricing power.

The investors who have done well in Nashville understand this at a granular level. The investors who have struggled often bought market-level optimism without doing block-level diligence.

If you want to run initial numbers before getting into block-level analysis, start with our calculator: Nashville STR Underwriting Calculator.

Checkpoint Four: Conservative Revenue Modeling

The final checkpoint is where most deals either survive or fall apart.

We rebuild the expense stack from scratch every time. Management fees at the high end of current market rates. Cleaning per turnover multiplied against realistic occupancy, not best-case occupancy. Platform fees. Utilities. Insurance riders. Maintenance reserves at 1.5 percent of property value annually. Furnishing costs amortized over a five-year replacement cycle.

We do not use the seller's expense figures. We do not use the management company's projections. We model conservatively, and we want the actuals to come in above our floor.

The output is a debt service coverage ratio analysis against real net operating income, not gross revenue. A property producing $70,000 gross with $30,000 in operating expenses has $40,000 to cover the mortgage. At current financing terms on a $600,000 acquisition, that number needs to pencil before the offer goes in. Not after the inspection.

"Nashville still generates strong returns for investors who buy correctly. The margin for error has narrowed, which makes disciplined pre-acquisition analysis more valuable than it has been at any point in the last four years." — Jack Costigan

What This Framework Protects Against

The pattern we see repeatedly in Nashville's STR market is investors who trusted optimistic projections over verified operating data. They bought the upside scenario. The property performed to the base case. The cash flow gap was not what they planned for.

The four-checkpoint framework is designed to catch that gap before the offer is written, not after the inspection, not at closing, and not six months into ownership.

Zoning eliminates properties that cannot operate legally. Layout eliminates properties that cannot compete on guest experience. Competitive positioning calibrates revenue expectations to the actual block, not the market average. Conservative modeling ensures the numbers work at the floor, not the ceiling.

"STRs amplify both good and bad decisions. If the basics are not right, whether that is zoning, layout, pricing strategy, or location, no amount of marketing will fix it. We run every deal through this framework before a client ever writes an offer." — Jack Costigan

If You Are Evaluating a Nashville STR in 2026

The market still works for buyers who approach it correctly. The deals that have performed best for our clients share one characteristic: the acquisition was built on conservative analysis, and the property outperformed it.

Start with the framework. If you want us to run it on a specific property you are evaluating, that is exactly what we do: Short-Term Rental Advisory.

If you are further along and want to discuss a specific deal, book time directly: Visit.

For sellers, the same logic applies in reverse. STR-eligible properties marketed to investor buyers need to be positioned around legal clarity, permit stability, and verifiable revenue history, not projected upside. Understanding how buyers evaluate these properties makes you a better seller: Selling.