Senack Real Estate has completed the following six sales totaling $12.87 million: * 654 St. Marks Ave.: The six-story elevatored apartment building is comprised of 30 units and was sold for $3.5 million. * 271 Sullivan Place: The four-story walk-up apartment building is comprised of 23 units and was sold for $2.1 million. * 1454 & 1456 Greene Ave.: The two four-story walk-up apartment buildings are comprised of 12 units and were sold for $1.45 million. * 2156 Cortelyou Rd.: The four-story walk-up apartment building is comprised of 12 units and was sold for $1.395 million. * 1791 New York Ave.: The four-story apartment building is comprised of 15 units and was sold for $1.625 million. * 651 E. 2nd St. and 1221 60th St.: These two four-story walk-up apartment buildings consist of 16 units each and were sold for $2.8 million.