I’m going to a concert pretty early, is there a place where I can wait inside the building or do I have to wait outside the building?

Venue opens often an hour before first act. There's also a plethora of bars and restaurants nearby

You will probably have to wait outside. However there are a few restaurants on the block where you can catch a bite while you wait.

You can't get in before doors open (usually an hour before 1st act). But there's a good bar & restaurant right next door

Depends on how early you are arriving. The venue announces when doors will be open before each show. It's typically an hour before the first act or opener. There are bars, restaurants, and shops nearby to explore if you're uninterested in standing in a line outside the venue.

They directed us into the back bar an hour before doors opened, but ushered us out to the line about half an hour later. There are lots of local shops and restaurants and such you can dip into, or you can wait in your car, the parking lot is pretty cozy to wait like that in actually.