I am guessing building in circle means this ... the usual circle building is a pagoda which is used to store thing of value / relic / scripture. in short thing that are money related ... valuable and expensive stuff. 

book does say round is money ... the china "tong chen" shape.

Your condo building front door... Aka reception area. That determine your chi quality. Your own unit door will either enhance it, if it's good or reduce it if it's bad. The risk is that when you used the unit door you would be exiting the chi there and spread it all over your house... Door is a door... Not much choice.

Unless you have a large balcony that can act as a chi storage... Else don't bother. Those recent launch with private sky garden at back... Think of it as chi kick back... Bonus. Of course if it's bad then bonus bad.

Those bad feature that people say you see from window or balcony is not sending you chi but is affecting the chi that is already in your house... Specific that sector. It turn vibrant and exited, hence hard to control and used.

If you find any sector happen to be bad, just go and use more of the good sector... It's impossible to have your door, bedroom, kitchen and leaving room all bad... Just choose to use more of the good one.