As they didn't sign the lease or a document agreeing to the rent increase, I don't know if you can do an eviction. 

I am planning either a 3-story 27 unit apartment building OR if I can purchase the combined 0.8ac parcels on each side of me, construct a gated condo community with end to end road access.

Plus 25% depreciation recapture (about 0.9% of the building value per year owned.) 

Hello, we had a tenant move out that we inherited with the building.

If by non-computer pull the filesStep 5: Record & Build Probate Mailing Listo The estate of, the date of, place where last dwelled (that is the subject property).

Once you're behind on that, you need to build a bigger cushion than what you got real estate investing.

@Jessica PerkinsTo make real estate a significant part of your retirement plan, leverage your experience in managing mid-term and short-term rentals, ensure your rental income is well-documented, research local market trends, and explore financing options.

The buyer had someone else pay more to build it than the value added, they had someone else do the associated work, they can get home purchase financing, they do not need to wait months for the ADU to be constructed.  

One was a new build and the others were rentals prior. 

@Garrett Mathis PMC software is mostly focused on tracking leases, tenant payments and then various other building data.