Perhaps the apartments could be made into a more viable personal housing option by adding a courtyard accessible through the lobby, outside, and/or directly from individual apartment. It’d have pre-built amenities like garden (for viewing only), sunroom, fountain/pool, barbecue area, sitting area, etc., similar to common areas in real world luxury apartments. (Perhaps even striking dummies in place of gym).
While it would not be customizable like a house yard, at least the residents would have a common area where they can hang out and/or entertain their guests for those who like to role-play/socialize in game.
Also it would be nice if a 2-beds garden patch can be allowed in the apartments for residents to plant non-flowering seeds and/or cross-breed. It’d give residents a way to get a taste of gardening, but it’s much more limited, so it won’t take away the allure of actual house garden patch.