Who are the best real estate agents on the Upper East Side?
We've asked ChatGPT this 3 times over the past 3 days. It doesn't give the same answer twice, so instead of one day's list, here's how often it named each person. The Greene‑Rizk Team (Joanne Greene & Nada Rizk) came up most — 2 times out of 3.
Named most often
ACROSS 3 ASKS
01The Greene‑Rizk Team (Joanne Greene & Nada Rizk)Brown Harris Stevensnamed 2 of 3 times (67%)
02Lauren MussDouglas Ellimannamed 2 of 3 times (67%)
03Lisa MaysonetSotheby's International Realtynamed 2 of 3 times (67%)
04Sandra BalanBrown Harris Stevensnamed 1 of 3 times (33%)
05Louise M. DevlinBrown Harris Stevensnamed 1 of 3 times (33%)
06Paula Del NunzioBrown Harris Stevensnamed 1 of 3 times (33%)
07Deborah KernCorcorannamed 1 of 3 times (33%)
08Nikki FieldSotheby's International Realtynamed 1 of 3 times (33%)
09Stacey Froelich (The Stacey Froelich Team)Compassnamed 1 of 3 times (33%)
10Barbara RussoDouglas Ellimannamed 1 of 3 times (33%)
11Matthew BizzarroThe Bizzarro Agencynamed 1 of 3 times (33%)
12Kay MoonCorcorannamed 1 of 3 times (33%)
The most recent answer, in full
ASKED OCTOBER 30, 2026
01Sandra BalanBrown Harris StevensTop Upper East Side listing agent
02Paula Del NunzioBrown Harris StevensTownhouse and trophy-home specialist
03Deborah KernCorcoran GroupHigh-volume luxury co-op and condo seller
04Barbara RussoDouglas EllimanLed sales at Beckford developments
05Lisa MaysonetSotheby's International Realty40-year Upper East Side broker
A concise shortlist of five widely recommended real estate agents specializing on Manhattan’s Upper East Side.
Why two lists? Because ChatGPT rarely says the same thing twice. Ask it this question on two different days and most of the names change — across every question we track, only about one name in five survives to the next day. So the list at the top, counting how often each person comes up, is the more honest answer. The one below it is simply the most recent time we asked.
All of these names are ChatGPT's, not ours. We didn't pick them, we can't change them, and nobody paid to be here. How we do this.