guldin mill, also known as lauer's mill, is a historic grist mill and national historic district located in maidencreek township, berks county, pennsylvania. the district encompasses one contributing building and one contributing site. the combined house and mill was built in two sections. the house was built in 1781 and the mill in 1822. it is a 2 1/2-story, stone building measuring 42 feet by 80 feet. also on the property are the watercourses, consisting of the headrace, two ponds, and tail race. the mill operated into the 1950s.