To locate avenue addresses, take the
address, drop the last figure, divide by 2, add or
subtract the number indicated below. The answer is the
nearest numbered cross street.
Here's an example:
Guggenheim
Museum = 1071 Fifth Ave
Drop
the last figure = 107
Subtract
by 18 = 89
The
Guggenheim Museum is closest to 89th Street
You'll
find this system works
within a one street number
margin of error.