Give her 30 days notice now, keep her security deposit, and send her a additional bill for damages to the unit in lieu of taking her to court for the damages.  

The process for commercial properties is basically the same as residential properties, so it takes work.Again, echoing Dominic, a good investment is a good investment, whether you spent 8 months courting an owner to get them to sell to you, or whether it is on CBRE/Cushman/Marcus/Loopnet or any other brokerage website.  

I've been doing some light reading, and it sounds like refinancing that property and using the proceeds to reinvest elsewhere might be a better option. 

BTW, it is illegal for a seller to receive any proceeds from the short sale,  however,  they may be qualified for relocation $$$ or other reimbursable expenses.   

Tax-Free Exchanges: While 1031 exchanges aren't available to SDIRAs, the tax deferral within the account means you can sell property and reinvest proceeds into new opportunities without immediate tax consequences.

We put up a Volleyball court in the back and plan on bringing in sand when the time is right.

If I got a home equity loan for Property 1 and used the proceeds as downpayment for Property 2 and then got a 2nd loan for the remaining 75% purchase price for Property 2, when I sell Property 2, can I use the Property 1 loan as part of the cost basis for computing Property 2 capital gains?

Use 1031 Exchanges to Defer TaxesIf you’re selling a property, a 1031 exchange allows you to defer capital gains taxes by reinvesting the proceeds into another property.

I have yet to get a response as to how to proceed.

@Paloma Wodehouse I started by going to Housing Court sessions and hearing the Cases and their "Dispensation of Justice".