This isn't a bad point. If you purchased a house in SF for $1m in 2009, there's a good chance it would sell for $1.8 mil today[1]. Rents have varied over time

This isn't a bad point. If you purchased a house in SF for $1m in 2009, there's a good chance it would sell for $1.8 mil today[1]. Rents have varied over time. I'd say the rent on a place like this would be $3k a month in 2009, and maybe $4k now. This is harder to estimate. Also, rent control is different for SFH than for apartments - in this case, I'll assume rent control is in place [1]. So, lost rent is 3k a month for 8 years, $288,000. Ok, that's some serious lost money. Gain in equity is $800,000. If your tenant make is hard to see and realize that gain, it really might make sense to leave it vacant. I have seen houses in SF sell for vastly below market due to existing tenants, with powerful rights (there are certain protected classes of tenant). There's a lot of room between 300k and 800k. It's not so simple, of course. It's expensive to be a landlord, and time consuming, and that income is taxed. So the loss of renting actually isn't $288,000, it's lower. Also, the house may be enjoyable as a pied a Terre. Think of it as any investment - you park your money somewhere, hope it will grown. Owning this house is no different from owning gold, or stock. You buy it, you hope it will appreciate. Buying and not renting could make sense as a mildly risk-averse approach - you give up some yields in exchange for the lower risk of not having a tenant. . At the same time, cash flow is tough. Many people simply can't afford to pay the mortgage for 8 years without that rental income. And they figure, eh, eventually the tenant will leave, and then they can sell. But overall? Yeah, I can see how it's economically rational to buy a place to speculate and simply leave it vacant[2]. Or, alternatively, rent only to extremely trusted people (family members or others treated as such). [1] I'm cherry picking dates and rent control policy to show the best case scenario for not renting a place out. [2] I believe this is harmful. Pointing out that something is economically rational (and in this case, perfectly legal) does not mean I endorse it!