于
yú
(of time or place) in; at; on; (indicating a source) from; out of
In a story
“本楼将于三月一日起停止使用。”“This building will cease to be occupied from the first of March.”通知 · The Notice · HSK 6
松园小区建于一九八七年，一共六层，九十六户。The Songyuan estate was built in 1987: six floors, ninety-six flats.空房间 · The Empty Room · HSK 6
Grammar with 于
于是
于是 — so / thereupon
关于
关于 — about / concerning
对于
对于 — regarding / with regard to
于
于 — at / in / than (formal)
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