Start sending your sesume to all the big commercial PMCs in your area.You could also try residential PMCs, but they typically pay less.

If an Accountant, a CPA or a tax preparer or anyone who is giving you this advice ...... ( I am not saying anything ).Here is another think - as you are flipping properties you do know that you are supposed to pay estimated Income Tax on your gains.

Move to ban their pet, and see how long the signatories continue to pay you rent or just move on. 

If your hoping for repeat guests (where they pay full rate and you don’t have to share it with Airbnb or VRBO), then provide hotel size shampoo, conditioner, body wash, small toothbrush and small tube of tooth paste.  

Some platforms, like Airbnb or VRBO, may handle the collection and remittance for you, but it's important to verify this.Make sure to register with the Florida Department of Revenue and Pinellas County to file and pay these taxes.

The new property can be purchased with the HELOC, but when doing your underwriting, the new property needs to be able to pay its own mortgage and the HELOC back.

They are good paying renters.

Was she paying rent to family during those years?

Is there any legal obligation to pay the unpaid utilities?

Maybe they wish they were doing more social media, maybe they wish someone would help with their calendar/inbox, maybe someone wants to start their own meetup, maybe they need help paying invoices and bills, maybe it's they need someone to drive them around so they can work instead of driving.