Analysis for Commercial development

[Brandon B.]

I have ownership of  a cashflowing commerical property that's approximately 4200 sqft. The property has two rentable units; however, it sits on 19000sqft of C1 zoned land. The structure has offstreet parking towards the front and a parking lot on the side. There is vacant land towards the rear of the structure and vacant land on the edge thats just as big as the parking lot. I'm trying to find a system of analysis that will aid me with the decision on what types of units to build and what type of financing to obtain. The property and land are lien free, so I'm considering commerical financing to build another structure. Any advice?