It is wholly impossible to be both a slumlord and a communist.

That's not to say that communists need to be wearing a barrel with suspenders and drink water out of a drain, but being a landlord is a uniquely scummy thing to do. Most of the people who end up in shitty housing do so because they're desperate and have no other choice, they are most likely going to be queer people kicked out of their homes, the disabled, the neurodivergent, people of color, undocumented migrants, and so on. You're not going to get a conga line of cis white male chuds to skim off the top of. Society is setup specifically so they're the least likely to end up there.

This isn't to scold you, I don't know what's in your heart. You're right that you're going through a bout of misanthropy, and this way lies ruin. If you're fine with exploiting the people named above as long as they're cis then you're cutting yourself off from solidarity. I would recommend becoming an ancap at that point. Because why pay taxes to provide public services to cis people, or pay union dues to a union that mostly benefits cis people, and so on. And if the conditions are going to be indeed scummy and exploitative as you'd imagine them then if your tenants rent-strike then every leftist will be on the side of the tenants. Because again, by becoming a landlord you cut yourself off from solidarity.

This is the ultimate trick that capitalism plays on you. To convince you that a better world isn't coming any time soon so in the meantime you might as well become the exploiter rather than the exploited. But capitalism can only perpetuate itself through exploiters, however you might try to rationalise it. I'm not saying you need to forgive cisciety, fuck it, but solidarity is how we build a better world.

Also, you missed your timing, all the housing was bought up by Blackrock. You might want to get a finance degree and defraud people's savings accounts instead.