The demolition of the old West Street Duxbury police station was bittersweet, according to Police Chief Matthew M. Clancy. Clancy said he remembers coming to Duxbury in 2010 and being surprised to see chipmunks running in the hallways of the building, which also suffered from a leaky roof and a host of other problems. “The condition of the building had gotten to the point that it was almost a joke,” he said. Still, he said, as crews knocked down the building a week ago, officers who spent many years there meandered over to watch it come down and reminisce. He said the station, built in 1966, resulted from the efforts of former Chief Lawrence Doyle, who died shortly before it was completed. A plaque dedicating the new building to Doyle was given to his daughter in April, when the department moved to the new $6.3 million station at 155 Mayflower St.