The office where I work in central London, UK has bike parking for 300 and only eight vehicle parking spaces. We also have a fitness suite. There’s two (male and female) locker rooms with showers, towels provided, a drying room.
At least one of the green building standards doesn’t give you the top rating unless you have provision for active travel, institutional investors won’t buy your shiny new building unless it’s rated “Excellent” or “Platinum”, tenants are looking for added extras which encourage their staff to come to the office rather than WFH.
And Westminster Council charges business rates (property tax) on parking spaces.
Most subway lines were dug after the city they go under was built, and, for example, there’s a whole lot of London on top of the London Underground. Very difficult to dig upwards, very expensive to dig downwards. In the above ground sections you’d have to rebuild all the road bridges.
Much easier and cheaper to run the most efficient service possible with a high throughput of trains.