consultation on wordpress commercial real estate website customisation

I have a commercial real estate website, my developer is using "Realhomes" theme and its "Easy Real Estate" plugin to manage properties uploading. I have two tiers of properties, parent tier is office buildings, child tier is office units inside office buildings. I upload office units using Easy Real Estate Plugin, and I built office building page using custom post for each office building. on the office building page, I show all units available in this building, as units are uploaded using Easy Real Estate, but buildings are not, how can I make sure uploaded units within the same building can be shown automatically on the individual building page which is built under customised pages.