What is that product/device that BP endorses for when you have multiple units on one water line and you want to effectively sub-meter it and bill it back to the tenants? 

They required a written endorsement of a neighborhood organization (thank you Community Coalition of Barnum) and then a presentation/pitch to a city panel.

What's especially strange is that we have never had an issue until we starting dealing with this lease cancellation and returning the deposit, at which time, the tenant began to be extremely hostile.The scanned image of the check online has no endorsement, but it does have a stamp on it, verifying the time that it was deposited, but not giving any specific bank information.

Zillow doesn't blanket endorse businesses.

I am searching for a way to rent to a pet owner but an extra $500 ain't going to cut it to replace flooring. I would need $8000 security deposit to cover the potential cost (ask me how I know!). Nobody loves their d...

I have no experience with them nor am i endorsing them.

Business relationships, co-producers of materials or co-speakers at a seminar, someone who endorses the method or program, coaches, "mentors" have acted in some area to be tagged as associates.

I also endorse everything she said. 

I don't think I can endorse any specific one, especially on a public forum, but you can reach out to members directly if you wish.I've been somewhat out of the loop, however, due to personal life circumstances, but I do see emails go by about them.

@Eric Piccione- There are several carriers who now insure AirBnb's or offer endorsements to specifically cover this exposure.