According to the brokerage and agent, these individuals either weren’t serious or claimed they didn’t realize the property was occupied, even though it was clearly stated in the listing.I’m not particularly concerned about the property’s condition or the eviction process, as I’ve already secured some level of cooperation and have basic access to the basement.

I think what I need is to find a lender partner that will work with me to secure 3-5 properties over the next year. 

Well there's a reason they screen their borrowers, secure their loans with a first position trust deed/mortgage and charge a small fortune to make such a loan.

Invest in a security camera—we had a break-in where someone lived in the house for days and stole appliances, which insurance didn’t cover.

Ensure the numbers align with your goals, factoring in cash flow, exit strategies, and risk mitigation.

That would allow you to dock their security deposit more than just for the prorated rent for those few days.

Being in control of the contract, understanding the market you're buying in, and securing the right  price are the foundations of a solid deal.

@Brian Bohrer I'd love to discuss your question in further detail to ensure I'm giving you the correct answer.

Something almost always comes up and that helps you be realistic when evaluating deals, securing financing, etc. 

Can I use her security deposit to cover these legal fees I've incurred due to her not moving out?