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Approximately 2000 sq ft from my recent measurement. I could be a bit off. I use less than that since I don't use the back offices - I sublease them out.
You don't always need to lead line the drywall. There are other variables involved. Have a physicist do the measurement and let you know. Your state health board will probably require an inspection either way. I just have regular drywall throughout the room and no lead within the wall.
