Does a handicap parking spot legally require a sign (not just a painted blue chair/lines) in New York State?

Question

is there a difference whether it's private property or not?

Answer 1

Yes, all states require a sign.

Answer 2

S T A T E   O F   N E W   Y O R K

Sign or decal must be posted..............

Private property as for a business, the law is the same and the owner must comply.