Again, things are not driven by popular demand. The idea that things are driven by popular consumer demand is liberal market mythology. They are driven by profitability, and the profitability on larger single housing buildings is better because it's a one-time large negotiated purchase, rather than multiple small fish negotiations. Profitability always wants to cater to the whale because it is easier to sit on an asset and then jackpot, and there are no bigger whales than at this time in capitalism. This then moves on to my second point, which is more on the ideological side of the materialist dialectic.

Have you ever actually met or known any rich people in the U.S.? I don't mean their fail-children that pretend to slum it up, or influencer-rich. I mean, honest-to-god 1% old-wealth rich people. They hate interacting with the public. They want to be as far away from the public as possible at all times. Even other rich people that they don't know or haven't been introduced to. These people already have private gardens, private gyms, private drivers, private everything there is no need for them to have a public space. The way they live is completely alien. They are on the side of cars because the car is a private space that separates them from the public. It probably doesn't even occur to them that they would like to be able to walk somewhere and walk back without a car. They just have whatever they need delivered, and then drive or are driven to wherever they want to walk around. The whales don't demand walkability, they demand privacy, and the car provides privacy. You say they could make bank, but they know in their hearts that's not true, and even if it were, I doubt it would even occur to them to ask. They assume everybody wants what they have, everyone values what they value, and that is what they are going to provide. Eternal private spaces.