I believe it's 48 North Terrace. Carolyn Keene was a pen name for Helen Stratemeyer Adams.
Here's a link from when the house was most recently for sale.
http://emailrpt.gsmls.com/publ...
HUGE Rummage sale to benefit the Bloomfield High School Robotics Team Sale Date: Apr 27, 2024
More info
Anyone know the exact address on North Terrace? I'm asking for a big Nancy Drew fan.