Most Cost Effective Multi Family Plans For My Land

HI guys, pretty new to the forum but not real estate investing. I have alot of rental properties here in houston and now I have 2 decent size pieces of land both on major streets, 1 is 33,000 sq ft and the other is 28,000 sq ft. They are both near lower income neighborhoods, think $100k homes, and its a very high traffic area.

I spoke with an architect last week who wanted $41,000 for the plans, I've never built anything before but that sounds high. What are my options for multi family for lots of that size? I will be paying cash, no financing, and am interested in various options that would maximize the land.

If its commercial ideas you have in mind Id love to hear ideas, I am not a full time real estate investor I own a chain of small businesses but as I said I have a couple rental homes and now these 2 pieces of land Id like to do something with. Thank you for your time