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...
Renovated apartment in Bloomfield
3 Bd | 2Full Ba
$2,850
Coffee mugs $1.50
More info
Anyone know the exact address on North Terrace? I'm asking for a big Nancy Drew fan.