A year after buying and restoring a “burnt-out wreck” of a building in Trenton in 1965, the owner of 112 Jackson St . hosted a Christmas open house to show off the improvements he had made and to introduce visitors to his neighborhood.

That gesture back in 1966 gave birth to what has become an annual tradition — the Mill Hill Holiday House Tour — and helped rekindle interest in a then-derelict section of the city.