if i were to win the 800 mil loto today i plan to rebuild my old plantation high schools basketball gym(class 2008). on or off-site. NBA style. ticket booth. locker rooms. cushion fan seats. top line consession stand. high tech. nba hanging score board and shot clocks. top of the line rims and backboards with the buzzer led lights in them. high tech locker rooms, trainers rooms, coaches office, ect.
Construction costs are determined by a number of factors, location, labor, materials, etc. If you were to win, I would suggest you don’t allow the contractors to know that you won the lottery. That could send costs soaring. Form an LLC or other business to handle the project. Or get a lawyer or financial advisor to set it up for you.