Would think laundry revenue would offset the additional water usage.Appreciate any thoughts!

If she wanted cash in addition to refinancing the current loan balance you could also look at getting a HELOC on the property if you have sufficient equity to pay her back her portion of the equity owed.

You have 180 days to complete your purchase.I'll reach out via pm with some additional resources including our youtube channel.

Get the owner out and convert the basement back just enough so its not a additional unit. 

Gross negligence often comes in the form of folks just not understanding fully their policy and most are not going to hire a lawyer to read over the insurance policy hence we like doing the additional asset protection.

I'd recommend that you weigh the potential benefits against the additional workload and potential difficulties that comes along your way.

I am a newer investor (currently 1 short-term rental in addition to my primary residence) looking to purchase a property that I will make into a short-term rental. 

Positioned on a corner lot, it boasts covered off-street parking with additional guest parking on the side.

Additionally, the charming architecture of the homes along the street enhances its appeal, making it a prime destination for investment.

Ask them to please be more mindful and if it happens again, add it to their ledger per their lease.