You need to write a tax accounting program for real estate

We need a program for accounting taxes on real estate with the display of objects on the map. The program has nothing to do with sales and commerce. I've got a function on the subject. I would like to hear your suggestions.
We plan to implement the program in a small company for our calculations in the organization.

Since we do not have experience with taxes and real estate, it is advisable to know how to work with the SMEV system. We see this program on the interface as an analogue of 2GIS. The rest is in the process of communicating with the performer.

Technical knowledge of SMEA is mandatory!