your rental summary

A.rental income

B.expenses

C.assets <---------<<<<< here click update

D. Vehicle Expenses

At the property asset summary screen for your property; click add an asset.t..Answer question to set up properly in the tax program

X rental  real estate property

X residential rental  real estate

you now have a 27.5 year property for the new windows a unit of property [Improvements to a building system are deemed an improvement to the building as a whole.]