XYZ Inc. is deciding whether to buy a new building. The building will increase cash flows by $$6,000,000$ per year. The building has a $20-$year life and will be obsolete $20$ years from today. The building is currently priced at $$22$ million. The cost of the building will decline by $$1,500,000$ per year until it reaches $10$ million, where it remains until it is obsolete. The required rate of return is $10\%.$

Calculate the NPV of the project, assuming the project is started today. $($Round to $2$ decimals$)$

Assuming XYZ is willing to wait and risk not being able to acquire the building, how many years from today should they wait to purchase the building to maximize the NPV$?$