Are Hong Kong building designs decided by wealthy business people, whose main aims are for big profits?

let me make your sentence better

Are Hong Kong architectural designs determined by wealthy businessmen , whose main aims are big profits?

to answer the question,

well, I'm not in the building industry, but I guess most of the time you need to listen to your boss (or your clients who pay for the project), unless you are some big deal world famous architect.

No, not directly.

The building design is decided by architects employed by property businesses to optimize the cost of construction and maximize utilization for sales per unit; the net profit of the sales is not decided by the building designer. Still, the property businesses (if you consider they're called wealthy business people) need to consider the profit margin in order to sustain its own business operation and financial status; otherwise investor/investment will depreciate. However, in terms of the housing/building cost, nearly half of the value is related to the land cost, thus the profit of the Government made from land sales is also very significant influence to the building design.