Decorations...

Surround your best buildings with decorations to increase your profits.
Good decorations to use are those that give more bouses than the space they take up. Bronze statue, pink flowers, arboretum, and the plaza are good examples. Put the large decorations as far away from the center as possible so you have space to fill in more little decorations.
You can create another ring around your initial profit square with some decorations. Iit is really very time consuming to move each building into the center to collect the max bonus. This also allows to collect the money and xp faster, thus increasing my bonus bar.
Franchises add bonus too, but are very large (5x5) and can block things behind them. Consider putting trees and goods storage behind franchises if you want to use them for bonuses. You get +2%/ floor.