the Seller and I have a good relationship and it's possible he'd be willing to pay off the mortgage prior to the sale

General Ledgers / Historical Capex: Ask for a full history of all major capital expenditures that have been made at the property during the owner's (and if available - prior owners') ownership term.

Are the Bigger Pocket leases not pre-vetted by an attorney prior to them publishing? 

So if the property goes into service in 2025, the cost seg must be applied on your 2025 tax return.However, since you plan to qualify for Real Estate Professional Status (REPS) in 2026, you can do a cost segregation study in 2026 and apply a catch-up depreciation adjustment (Form 3115, Change in Accounting Method) to claim what you missed in prior years.

I thought I had cancelled my PRO membership prior to the free trial period ending, but my credit card was billed today for the annual subscription at $417.

I have previously owned multi-tenant office properties and self-storage facility prior to 2008. 

Any advice on how to deal with these tenants prior to closing?

In addition to that, do you need to have it up & running as a STR prior to EOY or just have the closing?

Without seeing the denial letter I'm unsure why the title insurer would have denied coverage but as a clarification, generally a title policy only covers matters which arise prior to the insured's ownership, not during or after the insured takes title. 

Failure by Resident to obtain written permission from Manager prior to introducing an ESA is a lease violation.