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All elevation data is in meters and based off the NAVD88 vertical datum.The workflow for creating layer:Create building layer from structure layer provided in the planimetrics.Select for all Edit Types except \"Deleted\", which are buildings not present anymore since the last planimetric update. Then select for the following types: building, deck, smokestack, and water tower. Create new layer from this selection, this will be the new CityBuilding layer.Remove any buildings further than 250 feet from the city boundary.If there is a gap between the date the building data was created and the date this layer is made, add any newly constructed buildings. LAMA holds this information and site plans can be digitized to create them.Populate relevant attribute fields. 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