What's an acceptable BR size?

For "second" and "third" bedrooms, they're actually bigger than most.

This should go without saying, but it depends on the market in which you're positioning yourself to compete. In some some, those sizes would be lavish, but skimpy in others. For run-of-the-mill new construction, they'd be big.

Depends on how many bathrooms you already have. If you have 2, and one can be entered without going through a bedroom, that can work. But obviously, if you can add a powder room that is definitely a plus -

And don't get rid of the laundry room - in this city, that's a REAL resale plus.

"Is this acceptable in NYC for resale purposes?"

yes.

Those 3 bedroom sizes are fine for a family of 4 until the kids are teens. In the absence of other information, sounds plenty marketable to me. We sold a 5th floor walk-up where the 2nd BR was about 8 X 11 for nearly $1000 sq. ft. The laundry room is definitely a plus, and linen plus ample bedroom closets is a must.

Powder room is definitely nice for guests - most NY'ers don't entertain a whole lot so many will be OK to go without.

Thanks everyone for your helpful comments! I'm getting to the point in the reno where you second guess everything.

As far as the powder room is concerned, I have a hall bath that's located in a "private" hallway (don't have to go through a BR) and a powder bath on another floor. I was thinking it'd be inconvenient for guests to run upstairs or to go into our private space to use the toilet but including the powder room by the entrance requires me to raise the floor by a foot in the private hall BRs to accomodate the plumbing. There's something nice about the two little steps, but you lose ceiling height. It would be 9-9.5' after the raise.

Any further thoughts?

Don't know how others feel, but those "two little steps" could also be the source of some late night accidents.

If you don't mind guests going into a "private" bathroom, which is not within the bedroom, then don't really see why that can't work - except that you have to keep the bathroom neat when you're expecting guests. Otherwise, let them go upstairs.