Ground level parking isn’t really all that expensive, not unless you have very high land values. It does cost far more if you want to put up a multistory parking garage; from past reading, that’s maybe $30k-$50k per spot (though I’d still personally favor a parking mandate in that case, as otherwise you get people turning the street into a parking lot, which is awful for everyone, and parking illegally all over).

In the picture shown, though, it looks like townhouses, not high density housing, so the land value probably isnlt that insane.