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Yes, hosting own 3D buildings is possible. 

You need to upload own dataset in the vector format to MapTiler Cloud with buildings as extruded polygons (specify the height in building levels or meters). 

3D buildings are available by default in our Streets style. If you are missing just a few buildings near your area, you can add it to OpenStreetMap and they will be soon (in about a week or two) available on our map.