Lake County

Lake County sits at a gross rent-to-price ratio of 0.068, which translates to a cap rate of 4.42% at the median price point of $398,052. That cap rate is thin but not disqualifying on its own. The problem is what happens below the cap rate line. Financing at 6.85% on an 80% loan generates a monthly mortgage of $2,087. Add $789 in estimated operating expenses and you are at $2,876 in monthly carry against $2,255 in median rent, producing negative cash flow of $621 per month and a cash-on-cash return of negative 8.14% on the $79,610 down payment. This market is not a cash-flow market at the median. What it does offer is 6.01% year-over-year home price appreciation against an affordability index of 45, meaning prices are already stretched relative to local incomes. The appreciation score of 89 out of 100 confirms the market has performed well on price growth; the cash-flow score of 68 reflects the gross yield, not the net reality once debt service enters the picture.

This is an appreciation play, not a cash-flow play, and the investor profile needs to match that. A buyer who needs the property to service its own debt from day one should look elsewhere. The candidate here is someone with enough capital to absorb negative carry, whether that means a larger down payment to reduce mortgage burden, a value-add strategy where they're buying below median and repositioning rents above it, or a portfolio context where Lake County's appreciation track record provides equity growth to offset cash-drag on other holdings. A value-add operator could potentially narrow the gap, but at $398,052 median the entry price leaves limited room for manufactured equity unless the asset is meaningfully distressed. The 713,159-person population base does support rental demand depth, which gives some confidence that vacancy risk is lower than in smaller markets, but the numbers as presented require equity discipline, not income expectation.

The property tax situation deserves serious attention. Illinois carries a state-average effective property tax rate of 2.27%, flagged here as very high, and the annual tax estimate on a median-priced asset runs $9,036. Combined with $1,075 in estimated annual insurance, the monthly tax-and-insurance load is $843. That figure alone consumes 37% of the median rent before mortgage, maintenance, management, or vacancy reserves enter the calculation. At 2.27%, the state-average rate is high enough that it cannot be treated as a rounding error on your underwrite; it needs its own line, sensitivity-tested across the range of actual township rates, which can diverge materially from the state average. The caveat here is that 2.27% is a state-average estimate drawn from Tax Foundation 2024 data, and actual county and township rates in Lake County may differ. Given that Illinois routinely has some of the highest effective property tax rates in the country, underwriting to the state average as a floor rather than a midpoint is the prudent approach.

The stability score of 50 out of 100 is worth parsing. It sits exactly at the midpoint, neither a flag nor a reassurance. In a high-appreciation, high-cost market with a 45 affordability index, stability risk most likely comes from affordability compression over time, specifically the possibility that rent growth plateaus or reverses as tenants are priced out, even as home prices have continued climbing. An investor in this market is implicitly betting that the income base supporting $2,255-plus rents holds or grows. That is a reasonable bet in a 713,000-person county in the Chicago metro orbit, but it is a bet, not a certainty, and the stretched affordability index is the data point that should keep it in mind.

Compared to the neighboring counties in the dataset, Lake County's investment case is distinct in ways that make direct comparison somewhat awkward. DuPage County is the most structurally similar, with a median home price of $416,478 and a median rent of $2,040, but its rent-to-price ratio of 0.059 is measurably weaker than Lake's 0.068, and its overall score of 66 edges Lake's 64 only slightly. Adams County offers a rent-to-price ratio of 0.067, nearly identical to Lake's, but at a median price of $174,680 it is a fundamentally different asset class, where gross yield similarity masks dramatically different tenant bases, appreciation dynamics, and carry costs. Bond County scores 67 overall at $154,738 and Calhoun County scores 61 at $184,783, but neither has rent data in this dataset, making a yield comparison impossible. Greene County at $106,001 is similarly data-incomplete. An investor should choose Lake County over its neighbors when the explicit goal is price appreciation in a large, liquid market, when the ability to carry negative cash flow from other income is present, and when the risk profile calls for lower vacancy exposure at the cost of lower net yield. If immediate cash-on-cash return is the mandate, none of the richer neighboring markets solve that problem, and the smaller markets in this comparison set lack enough data here to evaluate fairly.