You have to open it in an older version of blender. I used https://download.blender.org/release/Blender2.74/. Then you have to export one house as DAE and check include UV textures and include material textures in the options in the bottom right. Once you have the textures, you can export all the other models as any other format and change the path mode to STRIP PATH in the bottom right of the export screen. This sets the path of all the textures to the directory the .obj or .fbx file is in, and you can use the textures you got in step 1.
You have to open it in an older version of blender. I used https://download.blender.org/release/Blender2.74/. Then you have to export one house as DAE and check include UV textures and include material textures in the options in the bottom right. Once you have the textures, you can export all the other models as any other format and change the path mode to STRIP PATH in the bottom right of the export screen. This sets the path of all the textures to the directory the .obj or .fbx file is in, and you can use the textures you got in step 1.