i can't speak to what their overall customer service has been because we only know what's in your post. 

Totally doable if that sounds like something you're willing to do.If you were looking to go that route, I'd recommend getting a Customer Relationship Management (CRM) software to keep track of leads and follow-ups.

You are able to do so as a regular private citizen.

As the Branch Manager for RBI Private Lending in Texas, I specialize in offering flexible financing solutions, including bridge loans, construction loans, multifamily financing, and DSCR loans.

If its a very large property, you may also want to make sure you are marketing to any wedding, family reunion, corporate meeting/team building customers. 

As soon as you start discussing your business practice and strategies with your customers (tenants), then all bets are off and you run the risk of Fair Housing violations. 

The long term goal is to do custom homes, starting with spec builds.

This is an on going topic, as a private landlord I would avoid if possible, If the owners of a building apply for funding for rehab the loans may be tied to lower interest rates if they rent to section 8 renters for a given number of years.

They offer flexibility in design and can be customized to include a business space.Shipping container homes: While trendy, these can be challenging for mixed-use (residential/commercial) purposes due to zoning and building code issues in many areas.

Ive also noticed a big trend in private lenders originating 2nds and gap funding and whatnot.