> I can just hardly live off the rental income I make, but its a lot less than my salary as a senior SDE
there is a large gap between "can live off of"(my words) and "a lot less than my salary as a senior SDE"(your words). If you're making more than the median household income which based on the fed numbers is ~84k/yr[1] you've crossed the line past small time landlord. You may be making less than that, but I am going to be surprised if you are with ~55 tenants.