Rethinking Rent vs. Buy in HCOL Areas: The Surprising Math

Show Notes

I'm Martin Maxwell. The median home in San Francisco costs $1.4 million. Put 20% down — $280,000 — and your monthly PITI is about $8,200. A comparable rental in the same neighborhood runs $3,500. That's a $4,700 gap, every single month, for the same roof over your head. And San Francisco isn't even the worst offender.

The 5% Rule

Take a home's value and multiply by 5%. That gives you a rough annual cost of ownership — mortgage interest, property taxes, maintenance, opportunity cost on your down payment. A $1.4 million home? $70,000 a year, or $5,833 a month in ownership cost alone. If you can rent for less, renting wins.

In San Francisco, comparable rent is $3,500 — $2,300 less than the ownership cost. Flip it to Memphis: median home at $220,000, ownership cost $917 a month, but comparable rent runs $1,400. Buying wins by $483. The 5% rule flips depending on what zip code you're standing in.

Price-to-Rent Ratios Tell the Story

Divide median home price by annual rent for a similar place. Below 15, buying favors you. Between 15 and 20, it's a coin flip. Above 20, renting wins — don't fight the math.

San Francisco's price-to-rent ratio: 38. You're paying nearly 40 years of rent in purchase price. Memphis sits at 11. Cleveland, 12. Indianapolis, 13. These are markets where buy-and-hold math actually pencils.

Geographic Arbitrage: Rent Here, Invest There

You don't have to live where you invest. Rent where you earn your income and invest where the numbers work. A software engineer in San Francisco pulling $180,000 a year can rent for $3,500 and deploy capital in Cleveland, Memphis, and Indianapolis. That same $280,000 down payment buys a triplex in Cleveland at $380,000 with $800 a month in cash flow. Do that three times and you've got $2,400 a month in cash flow plus three appreciating assets — while still living near your job.

Compare that to the person who bought the $1.4 million house: one asset with negative cash flow of $4,700 a month, entire net worth locked into a single zip code.

The HCOL House Hack

If you want to buy in an expensive market, house hacking is the one strategy that pencils. Find a duplex in an HCOL-adjacent market — Oakland, parts of Sacramento — where a duplex runs $600,000-$800,000. Put 3.5% down with an FHA loan on a $700,000 duplex: $24,500 down, PITI about $4,200. Rent the other unit for $2,500 and your effective housing cost drops to $1,700 a month. Less than half what you'd pay renting in San Francisco — and you're building equity.

Your Move This Week

Pull up your city's price-to-rent ratio. If it's above 20, you're probably better off renting and deploying capital elsewhere. If it's below 15, buying makes sense — and house hacking cuts the cost even further. The wealthiest investors I know rent in expensive cities and own cash-flowing rentals in markets they've never set foot in.

Resources Mentioned

• House Hacking: The Complete Guide — the full playbook from finding the property to screening your first tenant
• Duplex vs. Triplex for House Hacking — real numbers and tradeoffs for each property type
• Should You Rent or Buy Your First Rental Property? — the math behind the decision for investors, not just homeowners
• BRRRR vs. Traditional Buy-and-Hold — which strategy builds wealth faster in different markets
• Zillow Rental Market Trends — look up price-to-rent data and rental comps for your target market