Now I still feel interconnection is hard to estimate as investor even some of these information are available online and this is the biggest risk I am taking here.

Later I called an HVAC guy for estimate and he said to install central AC it would cost about 3500 - 4000$.

Because of this, unsophisticated appraisers reduce as-is value more than they should.2nd, the appraiser estimates the increase of value, based on your remodel plan.

Are their rent estimates realistic etc?

I am new to flipping and am looking to get a cost estimate of the following carpentry work. 

My Ex and I opened a restaurant on an “estimated table turn” per night that seemed reasonable based on what we thought we could get.

I got free repair estimates (inspections) from two roofing companies.  

Tenant agree that the reletting charge is a reasonable estimate of Landlord’s damages and that the charge is due whether or not Landlord’s reletting attempts succeed.

Never trust wholesalers they have no duty to you to tell the truth.so that being said.. just use them as a lead source.run your own comps. do your own inspections and have your rehab crew give you estimates.

You're better off starting your analysis with 1.5x a typical market rent (use BP or rentometer rent estimators) and seeing if a property would make sense as an MTR at those rents.