And are losing value on the property, which is the point of depreciation.
>~30 years later, you've deprecated it down to an effective value of $0
An no one will now rent, since your building has an effective value of $0 since it has become crap.
All throughout your list you ignore all the costs involved in being a landlord. Have any friends that have tried it? (I do). Did they become silly rich? Or did they quit because it is a major problem to actually make it very profitable versus other uses of capital and time? I'm a decently saavy investor (in many things), and have watched multiple friends start up rental properties, only to stop once it became clear that tenants destroy things, costs to maintain properties are volatile and astronomical, the work required is significant, and so on.
I have done the math on real estate investing many times, and each time have decided the returns are not worth it.
>The net result is that rental properties generate a ton of income for the owners
If it were so profitable, then tons of capital currently being spent on other uses (tech, medical, finance) would instead go into buying up more housing. But the fact is that being a landlord is not very profitable, so capital doesn't flood into that market - it is still mostly elsewhere.
Historically, housing has performed quite similar to the stock market for returns - as it should be. If housing were a better investment, money would flow in until they balanced. If housing is too poor an investment by screwing with taxes, then money will flow out into other more productive places. And if money flows out, people wanting housing will then have to pay even higher prices for less stock.