I am not entirely sure this is an intelligent question, but do you think the price of parking spaces will decline as much as the price of flats, more, or less?
More: cars are the first thing that people sell if they have financial problems, and parking is now a bubble caused by the higher taxes/fees for housing. When these taxes/fees are cut, people will sell parking lots and buy flats.
Less: they are (mostly) not bought with mortgages, so if the interest rates of mortgages increases, it won't affect car parks.
What do you reckon?