Google search gives me these super wide ranges and mostly talking about adding a bedroom in a SFH, which I'm not sure if applicable to this situation of "moving/subtracting a bedroom from one unit and add it to another unit in a duplex". 

I’m in the process of searching for land in the Houston area to then build a 4-plex on it.The plan is to self-fund the purchase & construction, rent the units and cash out with a mortage.I like the idea of serving lower income families and therefore don’t shy away from section 8.This is the first time I do something like this, so I’m throwing it out there in hopes of hearing your thoughts and learning from your experience!

searching as a realtor How did you finance this deal?

It's also fairly easy to do virtually.The money is made in land flipping on the "improvements" you make on the land.

BiggerPockets' search option is a good start if you want to speak with people in the community.2.

I hope you can use this feedback and improve the program for agents and investors.

Will the home rent well, or will you need to make improvements first?

Like use the search bar.....If you don't take the time to find the answer for your self than you deserve whatever blunt, critical feedback you get.That being said. 

Alex,Did a quick Google search and it appears to be foreclosed homes that were funded with VA loans.

Feel free to reach out to discuss your goals and I can connect you with the right agent for your search.