You should contact a Realtor in your area to visit your property and provide you with a Customer Market Analysis of your home. They will be able to give you a valuation of your property. Residential sales value is not determined by price per sq ft. We can always determine the price per sq ft once the unit is sold of course. Commercial property is based on price per sq ft. for example when pricing a 40,000 Sq Ft. warehouse space at $1.00 per sq ft.
Best of luck.
Coldwell Banker Star Realty