This postcard, recently sold on eBay, gives a view of downtown Darien as it appeared in about 1910, according to the seller.
The downtown railroad bridge can just be seen in the distance, and the street to the right appears to be Mansfield Avenue. In that case, the view is looking west, about where Post Corner Pizza stands today (to the right).
The building just on the other side of Mansfield Avenue, where Good Goods is today, may be the one that still stands there. The small part that you can see certainly looks similar in the modern picture and the postcard picture.
Or is this a view looking east? In that case the woman is standing in front of where CVS Pharmacy stands today, and the street on the right is Center Street, leading toward the parking lot in the back. But in the postcard picture, there doesn't seem to be a rise in the ground just to the left of the bridge, as there is in the picture taken Friday.
The long dress on the woman on the right of the postcard picture may indicate the picture was taken before the 1920s. It must have been hard to keep a dress like that clean with a dirt road running through downtown.