Brownstones vs high rises on UWS

On the buy side, your limiting it to condos makes it simpler. SE shows only 270 such for sale on the UWS, including rowhouses and regular buildings and stuff like 15CPW that isn't pre-war. If you do a search with price or size or ZIP limits, you'll get fewer than 200. Those you dump to a spreadsheet, delete those that're out-of-bounds, and then see what the ranges are.

Condos in a brownstone are very rare. Co-ops in a brownstone are much more common. Is that what you really mean? There are way too many variables in your question, assuming you mean a co-op in a brownstone (outdoor space, # of flights, detail, layout, etc.)

Personally I would never, ever buy into a small co-op building like a brownstone. The fewer the shareholders the more responsibility you'll have if big problems arise, like tenant defaults or major structural repairs. Resale not great in small co-ops either.