A triplex on Stock Island hits the DSCR math like this: three 3-bedroom, 2-bath units, an in-place rent roll that clears well into six figures a year, and a purchase price nowhere near what that rent roll would suggest in most Florida markets. Model that rent against the purchase basis at standard leverage, and after rolling in full principal, interest, taxes and insurance, the coverage ratio lands comfortably above break-even. Now model a single-family home two streets over at a fraction of that price, with a typical asking rent, at the same leverage — and coverage drops well below the 1.00x line. Same island. Same submarket. Completely different DSCR outcome. That price-to-income gap is the entire story of investment property lending in Key West.
At a Glance: An investment property loan in Key West, Florida is underwritten primarily on the subject property’s projected rent measured against its full monthly obligation — taxes and insurance included — rather than the borrower’s personal income, and on this island the unit count on the deed matters more than the square footage on the appraisal.
DSCR Calculator
Run the numbers in Key West, FL
Rate source: Freddie Mac 30-yr average via FRED® — Federal Reserve Bank of St. Louis · effective Jul 16, 2026
Prefilled with local estimates — enter your own rent or nightly figures, taxes, insurance, and HOA for a more accurate picture.
As of Jul 16, 2026 · General Freddie Mac market benchmark, not a Lendmire loan offer. Rent, nightly rate, occupancy, taxes, and insurance are editable estimates. Short-term rental figures are estimates only and vary significantly by season, property type, management approach, and local short-term-rental rules — confirm local regulations before relying on them. Qualifying income for short-term rentals varies by program — some use appraisal market rent, others use documented STR history or projections — and is confirmed in underwriting. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
- Citywide price-to-rent ratios run high, with the typical home value sitting well above typical gross rent levels (City-Data)
- Stock Island single-family homes sell at a median tighter than the citywide typical value (Zillow)
- A majority of Key West’s rental stock sits in small complexes under 50 units
- NAS Key West anchors thousands of local jobs and a substantial share of local economic activity (WLRN)
Key West Market Snapshot
A quick read on the Key West investor landscape — figures come from the cited sources below. Confirm current property-level numbers before underwriting.
| Metric | Detail |
|---|---|
| Home prices | $87,037 median household income (Census Reporter) |
| Typical rents | Median gross rent $2,231 (City-Data.com) |
| Population | 25,720 population (Census Reporter) |
| Employment | 85+ employees (Housing Authority of the City) |
Stock Island Carries the Single-Family Case
Stock Island is the strongest single-family submarket in Key West for standard long-term-rental underwriting — and it still often lands below a 1.00 coverage ratio on its own. That is the reality of buying a single detached house on this island, and it is worth sitting with before falling in love with a listing photo.
The numbers explain why Stock Island beats the rest of the city on this metric even if it does not clear the bar outright. Homes there sell at a median well under the typical home value zillow reports citywide. NeighborhoodScout puts the average rental price in the neighborhood in line with the broader citywide range. Modeling that rent against a single-family purchase basis at standard leverage, with full principal, interest, taxes and insurance included, coverage typically comes in below break-even. That is a real dynamic worth knowing before an offer goes in, not after.
A sub-1.00 result does not close the door — it changes which door an investor walks through. Lenders reviewing a file at that coverage level typically look at a larger down payment to shrink the loan balance, an interest-only structure to reduce the monthly obligation, or a sub-1.00 program designed for exactly this gap, subject to lender guidelines and credit approval. None of that is guaranteed financing; it is simply the menu a stronger file works from.
Stock Island earns its “strongest single-family” label for a second reason that has nothing to do with price: proven rental absorption. The Wrecker’s Cay workforce housing development on Stock Island leased out completely and still carried a substantial waitlist after opening, with strong demand across its one- and two-bedroom units (Keys News). That kind of instant, backlogged lease-up is hard evidence that year-round tenant demand exists at these rent levels — evidence an investor can point to when a rent-roll assumption gets questioned during underwriting.
The Multi-Unit Lever: New Town, Midtown and the Triplex Math
Single-family DSCR math struggles almost everywhere in Key West. Multi-unit math does not — and that single distinction should drive where an investor starts looking. Stacking two, three or four rent rolls against one mortgage is the most reliable way to close the gap between Key West’s median home value and its median rent, and New Town and Midtown are where that inventory actually exists at workforce-tier pricing.
A majority of Key West residents rent rather than own, and small-scale complexes under 50 units make up the bulk of the rental stock — this is not a niche strategy in a market dominated by single-family homes. Duplexes and small converted-apartment buildings account for a meaningful share of the city’s housing stock on their own, with large apartment buildings adding another substantial slice, according to NeighborhoodScout. Combined, that is close to half of Key West’s housing composition sitting in the exact property type that makes DSCR math work — plenty of depth to source from, not a handful of listings.
The triplex example from the opening holds up as the clearest illustration of why unit count, not square footage, moves the needle. A single 3-bedroom, 3-bath long-term rental at Key West’s typical three-bedroom rent would need nearly four times that monthly figure to match the gross monthly income the triplex’s three units produce together. That is the entire argument for buying the small-multifamily property over the larger single-family house at a comparable price point.
New Town and Midtown carry lower acquisition bases than Old Town or Casa Marina, which improves the rent-to-value math before any unit-stacking even happens. A workforce duplex modeled at standard leverage, with two units each renting near the citywide average, comes out close to break-even — around 1.00x. That is a tighter margin than the triplex example above, and it shows how sensitive this math is to the purchase basis. A modest price difference on a duplex is the difference between a file that clears comfortably and one that needs a larger down payment or a stronger rent comp to work.
Where the Math Breaks Down: Old Town, Truman Annex and Casa Marina
Old Town, Truman Annex and Casa Marina are not long-term-rental DSCR plays — they are equity and appreciation plays, and an investor should walk in knowing that distinction rather than discovering it at appraisal. These are the neighborhoods where Key West’s price-per-square-foot numbers get genuinely extreme, and standard rent rolls simply cannot keep pace.
Truman Annex commands the highest per-square-foot pricing in Old Town, with a premium average sale basis. Casa Marina, centered on Reynolds Street along the Atlantic shoreline, carries large single-family lots with a similarly premium basis. Running long-term rent against either of those price points on a standard 30-year DSCR structure does not produce a workable ratio; the rent side of the equation simply cannot scale to match.
That does not mean multi-unit stock is absent from these zip codes. Fourplexes in Casa Marina — multiple units across a single large parcel — show that legally configured multi-unit product exists even inside the luxury submarkets. An investor does not have to abandon Casa Marina entirely for DSCR fit; the play is hunting the specific fourplex or duplex parcel inside the premium zip code, not the surrounding single-family comps.
Can a Legal ADU Save a Bahama Village Purchase?
Sometimes, but not on its own at Key West’s price points — and that is worth stress-testing before assuming an accessory unit fixes the math. Bahama Village, the neighborhood locals describe as the city’s most culturally distinct pocket, trades at a modest discount to comparable Old Town and Truman Annex properties, though its recent average sale basis still runs high.
Model a Bahama Village conch cottage near that average, financed at standard leverage, with the main house renting near the citywide $2,548 average and a legal ADU cottage adding a further modest monthly figure. Combined rent still leaves full PITIA on that basis high enough that coverage comes out well below the 1.00x floor available on select programs. The ADU adds real income, but it is not enough by itself to offset a premium basis.
The lever that actually moves this deal is the purchase price, not the ADU. A Bahama Village or Old Town alley-lot property purchased well below the neighborhood average, with a legal second unit already in place, has a real shot at clearing 1.00x. Buying at the top of the range and hoping the ADU carries the file is the mistake that shows up in underwriting, not before it.
The Employer Base That Isn’t Tourism
Key West has an anchor most vacation-driven Florida cities do not: an active-duty military installation large enough to be the largest employer in the county. Naval Air Station Key West — spread across Truman Annex, Trumbo Point, Boca Chica, Sigsbee Park and Fleming Key — carries thousands of employees and contributes a substantial share of the local economy, according to a public radio interview with the base’s commanding officer (WLRN). The base hosts the Joint Interagency Task Force South headquarters along with multiple tenant commands, and the U.S. military is the top employer in Monroe County — one of only three Florida counties where that is true.
That matters for a DSCR file because military families, federal law enforcement and Coast Guard personnel draw stable paychecks and housing allowances that do not evaporate when tourism softens. Working DSCR brokers see a recurring pattern in markets like this one: files anchored to a federal or institutional employment base tend to hold their rent assumptions across seasonal swings in a way that pure vacation-rental markets don’t, because the tenant pool isn’t tied to visitor counts. That is a meaningfully different renter base than Naples or Sarasota, where tourism and seasonal second-home demand dominate.
Key West’s other institutional anchors round out the workforce picture. Lower Keys Medical Center, an acute-care hospital operated by Community Health Systems, provides 24/7 emergency and inpatient care and partners with Mount Sinai Medical Center in Miami Beach for specialty cardiac care. The Housing Authority of the City of Key West manages multiple deed-restricted affordable communities on top of its low-income units — a direct signal of how tight workforce housing runs on this island. Monroe County government and the Monroe County School District round out a public-sector base large enough to matter; the district’s living allowance for staff working near Sigsbee is its own quiet acknowledgment of how expensive local housing has become.
The Appraisal Problem Nobody Prices In
Key West is a thin-transaction market, and that shows up directly in cash-out and refinance appraisals more than most investors expect going in. Two widely cited sources disagree sharply on the same underlying trend: one reported the median sale price down year-over-year, while a separate market analysis cited the median up over the same broad window. The trailing 12-month sales volume is low enough that a handful of outlier transactions can swing a monthly median by double digits.
Working DSCR brokers see a recurring pattern in island and resort markets with this kind of transaction volume: appraisals swing wider than the headline price trend suggests, and a file underwritten to a maximum leverage pull on a single comparable sale is the one that comes back light. Investors buying in Key West should expect the same volatility on the purchase side — a comp set that leans on a broader radius or a longer look-back window than a high-volume mainland market would need.
What It Takes to Get a File Approved
Purchase financing on Key West investment property typically runs up to 75 percent loan-to-value, or about 25 percent down, under the guidelines most DSCR programs apply in Florida’s market. A minimum coverage ratio around 1.00x is a select-program floor several standard programs work from, though lenders may review files below that threshold with stronger compensating factors — more reserves, a lower loan-to-value, or a different structure — subject to lender guidelines and credit approval. Credit tiers within Lendmire’s wholesale network generally start around a 620 floor, with pricing improvements at higher score bands, and reserve requirements typically run about six months of PITIA — stepping up to roughly nine months on loan amounts above $1,500,000, which matters directly for a triplex or fourplex purchase modeled at that price tier. Loans through Lendmire’s standard programs go up to $3,000,000, with smaller balances routed through select lenders in the network.
None of that is a guarantee of approval — every figure above is a program guideline subject to lender overlays, property review and underwriting, not a promise. What it does mean is that a Key West multi-unit purchase with a documented rent roll, a clean entity structure if the property is held in an LLC (subject to program eligibility), and a realistic price basis has a defined path to review. Lendmire’s primer on DSCR loans breaks down how the qualifying math works in more depth, and investors weighing DSCR against a conventional mortgage can see where DSCR and conventional diverge on documentation and underwriting basis.
For a purchase involving a workforce duplex, a Stock Island small-plex, or a fourplex tucked inside a premium zip code, reaching Lendmire at 828-256-2183 or requesting a DSCR quote is the practical next step once a specific property and rent roll are in hand. Florida DSCR financing through Lendmire’s platform covers Key West alongside the rest of the state’s investor market.
DSCR vs. conventional financing
Two common ways to finance an investment property in Key West, FL. They qualify you differently — here’s how investors weigh them.
Why investors choose it
- Qualifies on the property’s rental income — no personal tax returns, W-2s, or pay stubs needed to document income.
- No personal debt-to-income ceiling to clear, so existing mortgages and obligations don’t cap your borrowing the same way.
- Can be closed in an LLC, keeping the property inside a business entity.
- Built for scaling — not held to the limit on number of financed properties that conventional financing applies.
- Underwriting centers on the deal: generally qualifies when the rent covers the payment, a 1.00x coverage ratio being a common baseline (confirmed in underwriting).
- Designed specifically for investment property, including long-term and, where the program allows, short-term rentals.
Where it’s strong
- Often the lowest ongoing financing cost for a buyer who fully qualifies on personal income — a fit for a first property or a cost-first purchase.
Trade-offs for investors
- Requires full personal income documentation and must fit within a debt-to-income limit — salary, existing debts, and other mortgages all count.
- Typically held in your personal name rather than a business entity.
- Caps how many financed properties you can carry, which can become a ceiling as a portfolio grows.
- Evaluates you as a borrower as much as the property, which usually means more paperwork.
How investors usually choose: a first or single property often optimizes for the lowest financing cost; portfolio builders often optimize for leverage, vesting in an LLC, and scaling past conventional caps. The right answer depends on your goals, the property, and current guidelines — both paths run through select lenders in Lendmire’s wholesale network, with eligibility and terms confirmed in underwriting.
Frequently Asked Questions
How do you qualify for an investment property loan in Key West, Florida?
Qualification runs primarily on the property’s projected or in-place rent measured against its full monthly obligation, rather than the borrower’s traditional personal-income documentation or traditional employment income. A lender will want a lease or rent-roll estimate, an appraisal supporting the purchase price, and — for multi-unit properties — documentation showing each unit’s income separately. Credit, reserves and loan-to-value all factor into the final structure, subject to lender guidelines.
What are the requirements for a DSCR loan on a Key West multi-unit property?
Beyond the standard credit and reserve documentation, multi-unit files need a unit-by-unit rent breakdown, not just a combined gross figure, since lenders review each unit’s contribution to total income. Purchase leverage typically runs up to 75 percent loan-to-value, and reserve requirements step up on higher loan balances — commonly to around nine months of PITIA above $1,500,000, a threshold a Key West triplex or fourplex purchase can reach quickly given local pricing.
Why don’t single-family homes in Old Town qualify easily for DSCR loans?
Old Town’s price basis has simply outrun what long-term rent can support. With Truman Annex and Casa Marina carrying premium land values and per-square-foot pricing, standard 30-year rent-to-payment math rarely clears a workable coverage ratio on a single-family home in these neighborhoods. These properties are generally better suited to equity or appreciation-focused strategies than to standard long-term-rental DSCR underwriting.
Does NAS Key West’s presence affect long-term rental demand?
Yes — it gives Key West a renter base that most comparably sized Florida cities lack. The base’s thousands of employees, drawing steady federal pay and housing allowances, support year-round leasing that doesn’t rise and fall with the tourist season the way demand does in Naples or Sarasota, where tourism and seasonal second-home buyers dominate the market.
Is Stock Island a good entry point for a first Key West purchase?
It’s the best single-family entry point in the city on a price-to-rent basis, though investors should model the numbers carefully rather than assume it clears standard coverage automatically. At current median sale prices well below the citywide typical value against typical local rents, a single-family purchase there often lands below a 1.00x ratio, which is why pairing Stock Island’s lower basis with a duplex or small-plex purchase — rather than a standalone house — tends to produce a stronger file.
About Lendmire
Lendmire is a non-QM mortgage brokerage, arranging DSCR investor loans through wholesale and investor-lending channels (NMLS# 2371349), serving 40 markets. Because DSCR programs evaluate a property’s rental income rather than a borrower’s personal income, subject to lender guidelines, the structure fits LLC-held Key West acquisitions, self-employed buyers and operators scaling past conventional loan caps particularly well.
Set Key West’s math against Marathon or the mid-Keys, and the comparison tightens fast — mid-Keys pricing runs lower, but the federal-employment anchor that supports Key West’s workforce rental base thins out considerably north of Big Pine. Set it against Naples or Sarasota, and Key West holds up on tenant durability even with the steeper price-to-rent gap, because those markets lack anything resembling a large federal installation absorbing rent independent of tourism cycles. The math favors Key West’s multi-unit stock over either comparison right now — the mainland resort markets simply don’t have a renter base this insulated from their own seasonal swings.
Lendmire’s Top Mortgage Workplace recognition is documented by Scotsman Guide 2025 Top Mortgage Workplace and Scotsman Guide 2026 Top Mortgage Workplace.
Investment property review
See how the DSCR math works for Key West, Florida
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Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. City-Data.com – Key West, Florida profile
2. Zillow – Key West Home Values
3. WLRN – How a City Within a City: Key West’s Navy Base
5. Housing Authority of the City
6. NeighborhoodScout – Stock Island profile
7. Keys News – Wrecker’s Cay project complete
8. NeighborhoodScout – Key West real estate
10. Scotsman Guide 2025 Top Mortgage Workplace
11. Scotsman Guide 2026 Top Mortgage Workplace
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Compliance and disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage broker and is not a direct lender, depository institution, financial advisor, or tax professional. Content in this article is general market analysis and educational information — not financial, legal, or tax advice for any specific situation. Lendmire does not guarantee loan approval; every transaction is subject to underwriting by the funding lender. Mortgage pricing and loan program guidelines are subject to change at any time without notice and vary by borrower characteristics, property type, and state regulations. Lendmire complies with Equal Housing Opportunity. Licensure verification: NMLS Consumer Access.
