Here's a really nice if slightly out-of-date New Yorker article about such conversions: https://www.newyorker.com/magazine/2024/05/06/can-turning-office-towers-

Here's a really nice if slightly out-of-date New Yorker article about such conversions: https://www.newyorker.com/magazine/2024/05/06/can-turning-office-towers-into-apartments-save-downtowns https://www.newyorker.com/magazine/2024/05/06/can-turning-of... I prefer to read this in conjunction with just seeing a table of data. The author talked to the architects involved and added more color to it.