Tatra costs me 58.5 mil. At a mil income per day, this building will take about 2 months just to pay itself off. Now ya wanna sell nanos and space centers on top of that? Get half the value back and ALSO wait for those buildings to pay themselves off when you buy them back...? In the long run of course it'll pay off, but there is also the opportunity cost and what ya could have been doing with the cash instead of pouring it all into a building. You're sacrificing gains to be made now for gains in the future. It doesn't make sense for me, butIf I had the cash, I'd go for it. Since I'd have to sell half my base-heck no!