He gave me the owner's number (Jeff) and I called him on the spot, hoping to be able to offer my services to help him find and sell more homes in the neighborhood.

You could go to work for a remodeler too perhaps giving bids, selling service or see if they will train you to be on a crew.You could also go to work as an ISA for one of the big wholesalers. 

Is this an offer to sell, invest, or broadcast?

They are more useful IMO for getting chunks of equity right off the bat thru value add and then either realizing that equity by flipping it and using for a down payment on something bigger or hold a couple years and then sell at that point to do that then. 

My materials come from distributors that don't sell to the public.

If the business sells (it’s currently listed), the rent payments would stop, but I’d still own the property as an asset.

The one guy I spoke with said they make money only when they sell to potential investors and they only sell new construction homes that are usually pre-leased to buyers (currently they are building in Texas state and Missouri State).

Currently selling two SFRs to 1031 into a seller financed 9 unit mixed use property - I am still excited to learn new strategies 13 years later.I have some of my investments on my profile and some info regarding each.

Seems like they aren't in a hurry to sell if it's been on the market that long and they have raised the price.

They want to sell for as much as possible.Use the broker's pro forma as a thumb to the wind guide for your interest along with the rest of the offering memo (right location, asset class, etc.).