I work for a large professional painting company now but am eager to getting back to doing what I do best, and that's running service companies.

If you want to set yourself apart, be courteous and professional and respect their time.Their main concern would be people looking in medicine cabinets for drugs and in dressers for jewelry.

Wife and I are young professionals in our 20s currently living in West LA for work.

I just bought a beautiful home and, while I dont need it, would like to move in two working professionals into the two vacant rooms while I lived I stayed in the master. 

Nancy NevilleNancy, You made an excellent point concerning protecting tenants/customer data but the reality is anything is hackable as you said and I dont believe from my Professional Experience that storing your information on your desktop is necessary safer than storing it in "the cloud"..

For exampleA/c condisation drain has a back up.

I wouldn’t get a RE license as a GC since I would them be a real estate professional and couldn’t get long term capital gains

Also, it has proven hard to extract information from local professionals like architects, that is not vague or conflicting. 

Whats have you found the easiest and most professIonal way to have all of them sign it?

It needs to be professional.