I'd bet there was a lot of money laundering going on in the real estate dealings, and he cut his brother in on the action as a silent partner.
Perhaps sham tenants funneling money from cartels pay 'rent' in cash, and the cartels take an ownership interest in the real estate through a cut-out, with Paddock getting a small percent to manage it.
Whoever he was laundering money for basically owned him and could pressure him to do whatever they wanted to.
I think the real estate business and his gambling are a smoke screen for his real business -- selling illegal guns, etc. from a swanky suite in Las Vegas. My theory is a meeting with an unsavory customer went sideways, Paddock was shot, and the unsavory customer is the shooter -- and is already back in Pakistan. Paddock had guns, ammo, and ammonium nitrate in Vegas and his home - salesman samples.
Just my theory, flame away.
I don’t think it is about the rents.
It’s about laundering funds obtained illicitly through a series of transactions that lead to the purchase of real estate.
The real estate can then be sold on the open market, or held as an investment. Once the original funds have been converted to real estate, they are clean.