관리사무소에

In a sentence

• 관리사무소에 전화를 걸었어요.

  I made a phone call to the management office.

  Here, '관리사무소에' indicates the location to which the action of calling is directed.

• 우체부는 관리사무소에 편지를 놓고 갑니다.

  The postman leaves the letters in the management office.

  In this sentence, '관리사무소에' denotes the place where the postman leaves the letters.

• 새로운 이사님을 관리사무소에 소개했습니다.

  I introduced the new manager to the management office.

  Here, '관리사무소에' shows the recipients of the introduction action (in a metaphorical sense).