English to French Tech/Engineering Construction / Civil Engineering business

Here is the sentence in which this term occurs:

The municipality conditions and parking ratios have major effects on the feasibility of the contract.

And here is the definition of the term:

A Parking ratio is a measurement that indicates the relationship between the number of parking spaces in a parking lot and the square footage of the associated building

But I still do not know how to translate this term correctly. ratio des aires de stationnement ou des places de stationnement??

Your help will be greatly appreciated, as I only have 2 more hours to complete the translation!