Welcome to Springfield Heights

Firstly....thanks LP! There's so much going on.....my apologies if it's already been asked....I'm back and too between the game and this forum!..... Is it best to buy all the luxury condos in one go? I've got 5 building at the moment, just wondering if I should get the other available 5 now? My brains on overload and storage has run out, (on the game, not my brain!) :D