The lots for sale: 1 lot at 50 feet wide by 120 deep.

After all the damaging and cleaning cost, can I keep the remaining balance of the security deposit for the Sept rent that she owes?

I have helped other on how to do a deep dive into finding hidden parcels ( especially prevalent on the west coast and one person in Nashville looks to have hit a home run). 

The previous tenants had a dog and a cat in the house, but upon their vacating the premises, the home was thoroughly cleaned by myself and then a cleaning service, most walls were repainted, wood floors were re-sealed with polyurethane, vents were vacuumed and furnace filter was changed.

Another solution: pay someone (not a tenant) to bring the garbage out, bring it back in and keep the grounds clean.

Give them a revised "clean offer" meaning no escalation.

@Kyle Abramov on my first deal, I jumped with very little deep analysis.

For the deep conversation, you should consult your tax professional. 

He’s in deep doodoo if he’s filing a fraudulent LP.....typically they will file an affidavit/memorandum of contract, not an LP.

You live here, and rent room by room and cover the mortgage and more.As cliche as it sounds, think of real estate as a deep pond with a ton of lily pads to jump on.