I'm looking at building a few specs and would have liked to visit with you.  

If not and damages are incurred by a tenant, or even someone visiting the tenant, the landlord can be held responsible.  

I started visiting websites and forums.

I will certainly notify my current buyer's agent of my previous bid or visit to a place. 

Your inspection report can help get you an idea about these and a contractor visit and estimates up front might be prudent if you are buying a fixxer.

Cash Flow and Appreciate values when sold far out weight whatever the tax consequences might be (including Cap Gains).My current exit plan has components:life time cash flow + appreciated sales value - capital gainslet me assure you while the gains are significant, the equation is massively net positive. 

What were the numbers on the deal and is it in a tourist visited area?

Assure them that they can strike out any of these numbers for confidentiality.  

Do I need to keep picture and the dates for the house which I visited?

Now, if you're not a professional, how can I be assured that all  the doors actually close or even stay open, that the windows seal, that trim actually fits as it should without filler or that a joist  you replaced was properly sized?