NEW CONSTRUCTION BASEMENT OR NO BASEMENT?

[Kevin Alvarado]

I am building a new construction but need to figure out the little things for the house such as a basement, 4 rooms upstairs coming up to 3000 sq ft, or 3 rooms coming down to 2500 sq ft.

This construction is in the Belmont Cragin area, Chicago, IL. The lot is 30" wide.

My question is if it would be a good investment to finish the basement or leave it unfinished. We are doing a single-family house. Basement, first floor, and second floor. Should we choose to do 3 or 4 rooms on the top floor?

I would appreciate any advice on anything. Thank you!