A rental apartment has a balcony off the bedroom. Many years ago, the balcony was enclosed with walls and windows to make the bedroom larger. Over time, the walls and windows that were originally added to the balcony began to leak whenever it rained. In 2014, an engineer was hired to come up with a plan that would fix the leaking problem.
His solution was to replace the leaking walls with a series of panels. Some of the panels contained windows so that the end result was functionally the same as the original design. The total cost of the job included the engineering fees, building permits, legal costs, panel costs and the cost of a construction crew to tear out the old wall and install the new panels.
Question: Are the costs associated with this project considered to be repair costs deductible from rental income in 2014 or are they capital costs that have to be depreciated over 27+ years?