vrdiver wrote:Advantages - maybe roof access? Certainly less noise coming from upstairs neighbours
Maybe a better view? Why not go and have a look at it and see if it really is the same (in which case you might be chuffed that yours will be worth more when you sell!) or whether it has anything going for it to account for the difference in asking price.
Less noise generally, e.g. from passing traffic, sirens, rubbish trucks, drunken revelers.
More natural light because there are fewer surrounding buildings.
Penthouses often have nicer fixtures and fittings, larger windows, skylights etc.
Nobody above you stomping about.
Access may be restricted to residents of that floor and their guests via a dedicated lift.
On the other hand, do you really want to be the richest person in a bad building or, for the same money, the poorest person in a nice building? Isn't there a saying: "Buy the worst house on a good street, rather than the best house on a bad street"?
