You can use the election for each property, assuming the dollar figures are not exceeded on each one.
Note that the dollar figure is the lesser of $10,000 or 2% of the unadjusted basis of the building property (as shown in the previous post). So, for example, if the building property has an unadjusted basis (presumably the cost to purchase) of $400,000, 2% would be $8,000.
