Residential cost, excluding marketing $0-$1000 for earnest money depositsCommerical would be $30k to several million depending on the building size, for appraisal, studies, lawyers, and opening escrow.http://therealdeal.com/blog/2014/10/14/joel-schreibers-waterbridge-flips-williamsburg-contract-for-106m-sources/

Best to research local sources (e.g., craigslist, driving around) and call pretending to be a tenant.You can try loopnet, especially if you mean a larger building or complex.  

Another great source of information is individual blogs found in peoples signatures.

I found a way to source fresh lists, in addition to learning where to locate the potential (buy- n- hold investor) buyers for wholesale flips... then determined that it would make more sense to utilize hard money and/ or private money, and perhaps LO those deals, vs. grossing only $5k. - $10k. on the average paper flip?

Another great source of information is individual blogs found in peoples signatures.

Another great source of information is individual blogs found in peoples signatures.

By "view" I'm asking, do you qualify the source of information you might use?

I believe primary sources of info are always best.  

Unfortunately I can not disclose the details about the source of the offer.But I really appreciate your answers here.

Another great source of information is individual blogs found in peoples signatures.