Rush tix for sold out show?

I'm sorry if this has been discussed, I cannot find an answer.

If a show is sold out, as per one of the ticketing websites, does the theatre still reserve rush seats at the box office? 

I'm in a last minute jam...

Any insight is helpful, thanks! 

Yup, there is no definitive answer for that. If the theater sets aside tickets specifically for rush than yes, they will be available even if the show is sold out. But that also likely means the show is very popular and rush lines will probably be quite long/you have to show up early.

Some shows however only sell whatever they have left day off, so if they are sold out that means no rush.

You could also consider Standing Room if you're desperate. Many shows have a SRO policy that they start selling once the show is completely sold out.

OP: If you tell us which show you're interested in, we can give you more specific info.