How much lower should a ground floor apt be

any thoughts guys?

10K more

Try these two threads for ideas:
http://streeteasy.com/nyc/talk/discussion/13311-first-floor-apartments
http://streeteasy.com/nyc/talk/discussion/466-is-a-first-floor-appartment-less-desirable

being on the ground floor is low enough. otherwise you are a basement apt.

Riversider:..otherwise you're a buyer in the cellar.

Knowing nothing about the building, I would say at least 30%-50% lower.

Does the price include window treatments? Security bars on the windows?

I think your question is too general to answer properly. Post-war, pre-war, midrise, highrise, brownstone? residential street, commercial, bars, restaurants, over a busy corner? windows overlooking the street, backyard, alley? Close to mechanicals, next door to the trash? Elevator building or walk-up? how's the light?
It could be anywhere from 50% less to 20% more, depending on the answers.

Is it an above ground first floor or below or even? If above or below, by how much?

Just a few more questions that need to be answered prior to assessment.

ground floor= maisonette. It all depends on something-or-other.

thanks for the feedback yes the question was very general a little more info, pre war, ues, quiet tree lined street elevator building limited light

?For large apts on the uws (I don't know how much that matters v. ues), look at closings at 270 WEA and 500(650?) WEA for maisonette apts.