Saint Johns County

Saint Johns County sits at a 3.2% cap rate against a median home price of $492,987 and median rent of $2,020 per month. The gross rent-to-price ratio of 4.92% is near the floor of what most buy-and-hold investors consider workable, and the modeled numbers confirm the problem: at 6.85% financing with 20% down, the monthly mortgage runs $2,584, estimated expenses add another $707, and the net cash flow comes out to negative $1,271 per month. Cash-on-cash return lands at -13.45%. That is not a rounding error or a pessimistic assumption; it is the arithmetic of buying a half-million-dollar asset in a market where rents have not kept pace with prices. Home values are also down 0.84% year-over-year, so the appreciation case is not carrying the load either. The overall score of 43 out of 100 and a national percentile of 8 place this county in the bottom tier for rental investment attractiveness across the 1,000 counties modeled.

This market, as the numbers sit today, does not suit a cash-flow buyer. The -$1,271 monthly bleed means you are writing a four-figure check every month before maintenance surprises, vacancy, or capital expenditure. An appreciation buyer could make a philosophical argument, but with prices already off 0.84% and an affordability index of just 30, there is limited evidence of a near-term catalyst that will compress that gap between rents and values. The most credible use case is a value-add operator who can acquire below the $492,987 median, execute a meaningful rent lift, and still underwrite the carry. Even then, the starting cap rate of 3.2% leaves almost no margin for execution risk. An investor who bought at, say, $400,000 and pushed rent to $2,400 would still be grinding for a cap rate most institutional buyers would reject in a gateway city, let alone a Florida county. The stability score of 50 suggests the market is not collapsing, but stability and profitability are different things.

The tax and insurance picture deserves a close look in the underwrite. Combined monthly property tax and insurance runs $641 on the median-priced asset, using a state-average effective property tax rate of 0.89% and an insurance rate of 0.67%. That $641 is already baked into the $707 expense estimate, so it is not an additional charge, but it illustrates how much of gross rent is consumed before you account for management, maintenance, or reserves. At 0.89%, the property tax rate is flagged as normal for Florida, which means it is not an unusual headwind here, but Florida's insurance environment has been expensive statewide and 0.67% reflects that reality. Worth noting: the 0.89% is a state-average effective rate per Tax Foundation 2024 data, and actual Saint Johns County or township-level rates may differ. Pull the county property appraiser data before closing.

Compared to the neighboring counties in this dataset, Saint Johns looks like the weakest cash-flow option by a significant margin. Miami-Dade prices out at $513,948 but delivers a rent-to-price ratio of 6.53%, versus 4.92% here. Pinellas County at $361,621 median carries a 6.74% ratio. Sarasota at $393,399 hits 6.61%. Martin County at $435,316 reaches 6.42%. Every one of those neighbors, despite carrying similar or lower overall scores (all at 44 versus Saint Johns at 43), generates meaningfully better rent yield relative to purchase price. Levy County is the outlier at $285,928 median, though no rent data was provided to calculate a ratio. The consistent pattern is clear: Saint Johns commands a premium price that rents have not validated. An investor choosing Saint Johns over Pinellas or Sarasota is paying roughly $100,000 to $130,000 more per door for lower yield. The only scenario where Saint Johns wins that comparison is if an investor has a specific conviction about Jacksonville-metro growth spilling further south into this county and is willing to carry negative cash flow to hold a position. That is a speculative bet, not a rental income strategy, and it should be underwritten accordingly.