Another option would be working with private lenders to see if they're open to your idea should you need additional funding. 

The way I can imagine is perhaps putting up additional cinder blocks but that sounds expensive.

In addition, they are bearing the risk of you backing out of the deal and them being stuck with vacant units not bringing in rent. 4.

While I can contribute some capital and sweat equity, I’ll need a partner to bring in additional funds to close the deal.Here’s where I could really use your advice:1.

We wanted additional units to pay mortgage and have cash flow.

To determine price range, the first step is always figuring our how much you are pre-approved for; and that can vary significantly when you are looking at multi-unit properties because of the additional variable of rental income that can be included in qualifying.

Additionally, I've been spending a lot of time evaluating condo / HOA management solutions and accidentally stumbled on ManageCasa, which offers a free trial and < 3 unit free tier that has allowed me the time to get in, kick the tires, and really appreciate their attention to detail and broad feature set that adapts to each unique industry sector.

.- Value add - How much does it cost to build additional storage units?

Where I live there are many benefits to the voucher program in addition to guaranteed payments. 

In addition to that, platforms like HomeAdvisor or Angi are great for finding vetted professionals, and local builders associations or the Greater Beaumont Chamber of Commerce may have directories or recommendations.