45 Milk Street is located at 45 Milk Street in the Downtown - Financial District neighborhood, MA, Boston, 02109. The Class B Office building was completed in 1893 and features a total of 68,995 Sqft. There are 322 office spaces for lease in the Downtown - Financial District neighborhood, totaling 4,184,823 Sqft of available office space. The average asking office rent per sq. ft. in Downtown - Financial District is $40.36/sqft/year. For Class A+ office buildings the average office rate is $59/sqft/year, for Class A office buildings the average office rate is $41.07/sqft/year, for Class B office buildings the average office rate is $39.34/sqft/year, for Class C office buildings the average office rate is $17/sqft/year. In Downtown - Financial District, there are 79 class B office buildings. In Downtown - Financial District, there are a total of 20 LEED certified office buildings.