I'd also find out who handles the listings and what they charge to do it.

I am interested in acquiring a 10-acre lot with a house listed for $1.6M in a Houston suburb and would like to investigate financing options for building a commercial structure on the property.

This is according to multiple listings right now. 

Once vetted, I compile this exclusive list and share it with my clients.

For each property listed through a Section 8 website, over 100 requests for application are received within the first couple of hours.

We keep making those lists for the biggest rent decreases, highest vacancy, etc.

What you can do is get a report what the properties were listed for, on the MLS and take a guess.

If I scale to a point where I no longer have time and have to outsource, that line item is already accounted for and the property will still be profitable.  

marketing such as google adds, Facebook, direct mail and I'm sure the list goes on.

In my local MLS, they would be listed in the 2-5 unit category.