When I internet search “residential definition” the first definition is ”designed for people to live in”.  

You can usually find them by googling "<location> real property search".I see you're in Charleston, SC.

I look at debt and quality of tenant when I am searching for my clients.

I searched for it on the file space and I was unable to download it.Thank you!

I don't see anything on the website or with a web search on how to go about applying for the mastermind.

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?

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

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