After you sell your primary home, move into the condo for a few years then sell it to avoid the taxes.
They got rid of this rule years ago (2010?). It's now prorated based on the time you lived in it.
I thought it was based on the last 5 years, meaning if you owned the rental for decades, move in, and five years later sell it, you can claim 100% primary exempt.
Not that I'm aware of. Have any citation for that?
I think it's all years since this went into effect, in 2009. So if OP moved in for two years (say, 2017 and 2018), they could exclude 2/x years (where x = total since 2009 that they owned it.. they said "bought in the crash" so I'd assume some time in 09-11, so probably 7-9 years), and the other (x-2)/9 would be not-excluded.
As always, check with a professional, but this is my understanding. Feel free to correct me if you have another opinion. :)
EDIT: If it was owned longer than that, as a rental, all those years count as well, obviously... was just focusing on bought since then. See bacchi's post right below this one, and links, for better info. :)