[Rietty]

It's one of the wealthier neighbourhoods afaik, so apparently it's pretty nice. I think 'low 80s' means when they started renting there.

[FFP999]

"Early 80s" would refer to the year. "Lower 80s" in Manhattan means they live somewhere in the area bounded to the south by 80th Street and to the north by 85th Street--which includes part of the Upper East Side.