1031 a multifamily u live/d in?

[Account Closed]

I just recalled that when in NYC i needed(?) to use an attorney to close on my long-term multifam flip (usually at 2 yrs owned/lived in) and usually the first words out of lawyers mouth was 'why don't u do a 1031 even exchange?' or something like that.

i never really paid attention to the particulars as to what and what can't be 1031, despite being in RE for a decade. or, i keep forgetting and too lazy to refresh.

 so what is it, i forget.. it has to be an investment property and can't be your primary residence?