一坪本社[hitotsubohonsha] small company headquarters located in Tokyo simply for name value
延べ坪数[nobetsubosuu] total floor space
坪数[tsubosuu] floor space
坪当たり[tsuboatari] per tsubo (area)
建坪[tatetsubo] floor space

延坪[nobetsubo] total floor space
建坪率[kenpeiritsu] building-to-land ratio
地坪[jitsubo] ground or land area
立て坪[tatetsubo] unit of measurement, about 1.8 meters cubed