Breakdown of heijitsu ni shite wa, shiyakusho ga konde iru.
Questions & Answers about heijitsu ni shite wa, shiyakusho ga konde iru.
にしては means something like for, considering, or given that, and it often carries a nuance of unexpectedness.
So:
平日にしては、市役所が混んでいる。
= For a weekday, city hall is crowded.
= Considering it’s a weekday, city hall is surprisingly crowded.
The speaker is saying that the situation is a little unusual compared with what they would normally expect on a weekday.
Because にしては is a set grammar pattern.
平日は、市役所が混んでいる。
= As for weekdays, city hall is crowded.
This sounds like a general statement about weekdays.平日にしては、市役所が混んでいる。
= For a weekday, city hall is crowded.
This means it is more crowded than you would expect for a weekday.
So にしては adds the idea of comparison with a normal expectation.
