This kind of strange. a 15000 sq ft could take a 1000 amps but to sell a single space of 15k sq ft is rare. No one is going to want one service in the plaza. You place a 200 amp service at one end to provide "white box" power and then get with the power company on how you can provide separate power to separate units. The last 15000 sq building we did had 600 amp 3 phase, but this is light for some tenants,