Has anyone used RABBU to market their short term rental for sale to potential buyers?  If so how did it go?

Consult with competent legal counsel to guide you regardless of your choice here.

A good friend of mine has a real estate related service business he wanted to scale.  

If they fail to comply, you may need to involve legal counsel or contact your state’s real estate commission.Hire a Reliable Manager: Finding a professional, responsive property manager is key.

They will also dictate the terms of the loan, how it's filed, qualifications, etc.However, if you mean PML as in your friends/family that have NO experience in real estate and just have money sitting around...then I would certainly to counsel you to lean on some type of mentor or other experienced investor in Houston on what to do. 

I would put it on craigslist and FB to see if anyone wants it for free.Otherwise call a junk removal or abandoned car removal service. 

You may need to seek legal counsel on this.2) Get all the info about your rental property as possible: leases, rent ledgers, tenant contact info, etc.3) Start looking for a new PMC4) Execute your termination notice5) Once transfer is complete, circle back to decide if worth suing them.

A service similar to Google Voice? 

Quote from @Dani Murai: Any recommendations for a reputable general contractor that services the Torrance/Gardena area? 

If you're not sure about your contractual rights and obligations, seek legal counsel.