Buyer as ghosted me as I suspected she would and now I've loss 30K with no way to collect.

Checking: collect all income here, then use it to pay bills.

The typical rent collection sites are not what I'm looking for. 

Here's a good breakdown of your options for tax collecting starting Feb 1 based on the new regulations.

If the property manager uses a payment app integrated with the property management software to collect rent for the landlord, this is not gross income for the property manager.

.#2 if the owner doesn't want to buy it back, I can begin collecting rent since I control the deed in my name at that point.  

Collecting rent, preserving the asset, minimizing vacancy.

Keep looking for a tenant - also have they already paid you through the end of he lease or you still have to collect ?

The previous landlord only collected half month rent as deposit, and I would like to increase the deposit to standard one-month.

This money is still owed by the tenants and at times we were able to collect some of the money for the damages.Regarding installing a sprinkler system, it's only helpful if the tenants don't turn it off.