There are plenty of these too. But street parking is always free or at least ~an order of magnitude cheaper, which is why people don't want to lose them

Less snarky answer than most people are giving you: street parking is free, while parking garages cost like a significant portion of your monthly rent per month.

There's parking garages all over the city.

Incredible idea, I wonder why nobody thought of that.

Step 1: Find a huge open space that can be paved over.

Japan has giant vertical parking garages with automated lifts. 15 stories, but it only requires a small piece of land. I'm sure you could make some money on that