You would have to either manually generate the gallery for each of the properties and store the code to add the gallery to the page in the database.
As far as automating generating a gallery, you would have to manually code something do this, so its not supported. I can give you some pointers on what you would have to do, but you will have to implement it yourself. To get the gallery generated, you would have to insert a new row for each gallery into the pg1_gallery table. Then upload the different sized images for each image that the gallery would use with the correct names and insert the correct information for each of the images uploaded into the pg1_gallery_images table. If you decide to go this route, I will not be able to give you much assistance on getting this implemented.