This is the 10166th most frequent Korean word.
관리사무소에
"관리사무소에" means "to/of/at the management office" in English.
Here, '관리사무소에' indicates the location to which the action of calling is directed.
관리사무소에 전화를 걸었어요.
I made a phone call to the management office.
In this sentence, '관리사무소에' denotes the place where the postman leaves the letters.
우체부는 관리사무소에 편지를 놓고 갑니다.
The postman leaves the letters in the management office.
Here, '관리사무소에' shows the recipients of the introduction action (in a metaphorical sense).