ALTER TABLE buildings DROP COLUMN IF EXISTS has_extension;
ALTER TABLE buildings DROP COLUMN IF EXISTS extension_year;
ALTER TABLE buildings DROP COLUMN IF EXISTS developer_type;
ALTER TABLE buildings DROP COLUMN IF EXISTS building_designers;
ALTER TABLE buildings DROP COLUMN IF EXISTS designers_source_link;
ALTER TABLE buildings DROP COLUMN IF EXISTS lead_designer_type;
ALTER TABLE buildings DROP COLUMN IF EXISTS designer_awards;
ALTER TABLE buildings DROP COLUMN IF EXISTS awards_source_link;