Mary's first major TV role was on the Dick Van Dyke Show, which debuted in 1961. Like most shows, it was filmed in a studio in Hollywood, CA, however the setting for the show was a fictional address on Bonnie Meadow Road near the New Rochelle/Scarsdale border, chosen because show creator Carl Reiner once lived in a home on that street. The cache is as close to that street as is possible without having a lot of muggling eyes from neighbors and unfortunately due to a lack of good hiding locations, is a nano. Don't forget to bring a writing instrument.
You can pretty much park right next to the cache if need be, just be careful of oncoming traffic and nearby neighbors.
Here is a link to her Wikipedia entry: https://en.wikipedia.org/wiki/Mary_Tyler_Moore