Complex sentence: The building is currently owned by Bank of America, although the Hearst Corporation also has offices in the building.the upper floors average 24,000 square feet compared to an average of only 20,000 square feet for the lower floors.
Split into simpler sentences: The building is currently owned by Bank of America, although the Hearst Corporation also has offices in the building. The upper floors average 24,000 square feet compared to an average of only 20,000 square feet for the lower floors.