I have a funny anecdote about developer building high rise condos in a very crowded market, take some shortcuts to squeeze in as many units as possible under the local zoning law, and pay the consequences.

I know people who live in a newly built high rise condo in a very crowded, popular city to live in west side of US. It was built during the recent building boom.

Recently they found out that about a few dozen units in the building have filed claim against the HOA/owner due mold under carpet, that starts around laundry machine.

The outbound water pipe connecting between washer and the main outbound pipe of the building is apparently too small. When the washer is in use, it builds up too much pressures and starts a slow leak behind the washer. This is in a hard to view area and goes undetected, starting mold problem.

I was told that the builder wanted to fit in more condo units but stay below allowed outbound sewage pipe size (?), so the hack they came up with is using narrower pipe between the washer and the main outbound pipe in the condo building.

Yes, builders don't have to build/pay for roads and other infra, but indirect cost is always paid by someone else. Even the residents of the development.