If you want to PM me the address and info I can give you more specific opinions on the property and what this turnkey company is telling you about rents.

I may be wrong, but it could be that company having bought 2011-2015 taxes is forcing tax foreclosure and thus it's only based on those years.

After giving this vendor a $15k deposit I started to get some weird vibes about them and called the utility company.

@Justin StearnsEncourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

You have $1.5+ million home and you're paying $2000 property tax a year, probably a paid off mortgage  if you bought in 1970 for example, and can charge market rate rent (multi units are under rent control with existing tenants, generally speaking, but not SFHs so far) Be really careful with whoever gives you numbers on a spreadsheet whether it's a turnkey company, agent etc. 

From there, I'd recommend reaching out to some of the smaller property management companies in your area.

I'm working for a family run real estate investment company and we're new to the DFW area.

It is managed by a company.

He is on an amazing journey towards "Branding" his company with so many services for all kinds of investors from experience to accredited.

By no means does any modular company use 20% more lumber than a site built home.