The Zillow estimate is not reliable at all.

Silver also has superior industrial use, notably in some emerging industries such as microchip manufacturing and alternative energy devices. 

Real estate professionals usually ignore Zestimates due to ridiculous lack of reliability, and I doubt Redfin is any better, and particularly given the wide disparity between one and the other, you might want to do your own comparables.It's not that hard.

I am getting quotes on removation/additions and want someone who is reliable and gives resonable quote.

For compatibility and reliability.

Does anyone know a good and reliable real estate agent/ broker in the area of Detroit?

I'm looking for a referral for a good reliable Property Manager in St Louis MO Area. 

Cons: Not everybody knows someone with that kind of cash; it’s their personal money so emotions are involved; unless they are a seasoned RE Investor, they are not a reliable 2nd set of eyes on the deal.Note: regardless of strategy, I always recommend finding who you plan to use for refi up front and ask their advice.

Yikes that's much worse and really underscores the necessity forba reliable contractor.

One key item I have learned so far in my pursuit to build a real estate portfolio is finding deals takes time and energy, and to find great deals almost comes down to being in the right place at the right time.