ON/ Finished Ceiling 20,000 20.000 12.610 Finished Flooring 10,200 20,000 1.800 Interior Wall Partitions 8,640 8,380 5,520 Doors within Interior Walls 1,400 800 500 Built-in case goods 500 800 400 Exterior and Party Walls 13,820 13,820 13,820 Less Exterior Windows and doors -2,280 -2.2