Hey Rodney, I develop multifamily properties in South Phoenix. I'm a GC and have a real estate license. Here's what I'd do. You've already got units making you money, utilize that extra land to make yourself more money with very low risk.
1. Consider what additional units you would add. (Ive got a group of people to bounce ideas off of, happy to discuss. And I'm currently building in the area) Do a market analysis to see what has the highest rent vs cost to build. 2 bed units? 3 bed? Garage, no garage? Etc
2. Do your numbers again and find out how much more in rent you'd get.
3. Find a bank that'll lend you the money to build and put permanent financing on it. Ultimately, since you're not paying for land, you should be able to build more units and add enough value to the property that you don't need to bring in any money of your own.
4. Execute the plan, build the units, get the long term financing that covers the extra builds, collect more rent and lastly, increase your net worth substantially.
You're sitting on untapped money with buildable land. I'd be happy to buy it off you, or partner with you or you can hire us to help make this happen. 480-468-6611