I can imagine a PSO2-style apartment with small outdoor section, or something like Bokairo's Inn room but being able to use that outdoor yard section as garden / limited outdoor furnishing area.

As revenue incentive, they could maybe put on the 45-day demolish time limit for these "extended apartments".

I for one would let go of my plot if apartments would let me garden. Maybe just on my server, but the housing zone is usually pretty dead social-wise.