 In 1862 , the remaining 35 members purchased two lots at the corner of State Street and Boerum Place in Boerum Hill for $ 3 @,@ 000 ( today $ 71 @,@ 000 ) , and on January 12 laid the cornerstone for a new building , the first synagogue built on Long Island . The building was completed on August 12 , at a cost of $ 10 @,@ 000 ( today $ 237 @,@ 000 ) , and was consecrated on August 31 by Alexander and assembled dignitaries . The synagogue , which came to be known as the Boerum Schule , created a Sunday school soon afterwards , the first in Brooklyn , and at the time , an innovation . The school was free , and run by volunteers , with separate classes for boys and girls . By 1890 the school had 160 students , and at its peak the school had 500 pupils . 
