> longitude/ latitude for this spot for instance the exact location of the
> entrance of the CEPSR building in columbia university as opposed to the
> back entrance on the 122nd street.
>
> Is this in any way possible
Sure, hire a surveyor?
Or, depending on what you mean by "exact", taking a GPS reading would
be within a few metres.
Or, put the address (530 West 120th Street New York) into
maps.google.com You might be able to use streetview to fine-tune
that.