Custom Post Hierarchy and users

Personally I would:

1: create Post with type Building (you can then add meta to this eg: address, lat lng, name etc)

2: create Post type Apartments and associate with building via apartments post meta

3: create metabox for owner for post type apartments, here you can GET all user info with role as owner/landlord and add to post meta

4: as above but for tenants, GET all users with role tenant, when apartment is let.

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