It depends what specific Posts of the "Building Information" you want to display, as example if you want some "Geo Location" feature, this is not possible, as Views does not feature a GeoLocate feature.
But let's assume you want to assiciate some "Client location" to certain "Building Information", then you would as example head to Toolset > Post Typey > "Building Information" > Edit and set the Post type "Client location" to be a child of the "Building Information".
Then you can associate many of those Clients with one Building a time.
To display that then you would create a View that queries Clients, and call the parent Building Field in it, or, create a View that queries Clients and insert it to a Building Post, so to display the associated Clients.
But this is reather watery, I need to know what exactly you want to achieve, and how the data has to be displayed on your Front end to reply you more concisely.