Office = 办公室 [Bàn gōng shì]
A desk with two monitors and a potted plant stands outdoors, plugged into the building by a long cable. “The whole world is your office,” and an office is an 办公室.
办公室 (bàn gōng shì) means “office.” 办公 (bàn gōng) is to do office work, and 室 (shì) is a room.
她在办公室。 — Tā zài bàngōngshì. — She is in the office.
我的办公室很小。 — Wǒ de bàngōngshì hěn xiǎo. — My office is small.