They should have been depreciated and added to basis then subject to recapture at sale.  I dont think you get to add them back to the basis now otherwise youd be deducting them twice with no recapture. 

The Sch E worksheet near the top should have a Box H  to check as the property is being disposed.

Use the rental Asset Entry worksheet for the disposal.  Scroll down the page to the disposal section, you can put in the date, the sales amount and the sales expense figure.