or have the current seller provide said info. with proof of payment and or renters insurance, turnover of security deposit & first months rent which my attorney will also be collecting, With it being such a quick turn-around with their current lease expiring I want to have as much lined up as I can and be the most prepared I possibly can.Currently Still in the process of bulletproofing the new lease along with the operating and reserves accounts & setting up account/property management software.

Any recommended billing service providers that service my property size in CA?

They can also provide comps.

This can be done through linking up with local investment groups, or go to meetings that provide such interactions.

The Architect working directly for me will provide me with more leverage and peace of mind. 

I think HH provides these new home buyers the opportunity to purchase a home with some financial flexibility being able to rent out portions for extra income. 

Have you tried to ask the Turnkey providers to show a bid to buy it back?

The other 3 above should be able to provide referrals, but don't blindly trust anyone!

Larger national companies like State Farm, Allstate, and Liberty Mutual are known for providing comprehensive coverage, so they could be good places to start your search.

These syndication can provide an 8%+ cash-on-cash return - providing investors monthly cash flow - and a 15-20% IRR over the length of the project.