Purchased house 2014 for flip resale. In 2014 & 2015 wrote off utilites, taxes on Schedule C. Sold 2016. Should the 2016 1099-S be entered on Schedule C or Investment p?

Puchased to start a business, but determined will not be purchasing another property. Do I need to continue with the sale of the property on Schedule C or under Investment Property? and if Investment Property what do I do about the 2014 and 2015 Schedule C expenses?