For years I put in all my contracts that a specific appraisal company could not be used for the appraisal of any deal I was doing because their results were consistently so low it was laughable.

I was an investor first but now manage a property management company in central CT.  

As for the quality, it depends on company. 

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.

Within that time frame the business's revenue has grown significantly and has outran my tax write-offs from buying the company.

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

Federal lending limit around $20mm per customer as a reference point.Asked how is the financing outlook from their banks standpoint.1.  

@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.