The details matter. from pub 544:

Easement. The amount received for granting an easement is subtracted from the basis of the property. If only a specific part of the entire tract of property is affected by the easement, only the basis of that part is reduced by the amount received. If it is impossible or impractical to separate the basis of the part of the property on which the easement is granted, the basis of the whole property is reduced by the amount received.

You should research pub 544 yourself to see all the rules, as you have all the details