Facing Manhattan Beach Park on Ocean Avenue is the church of St. Margaret Mary. The parish, established in 1920, seems to own the short block along the south side of Oriental Boulevard from Exeter Street to Ocean Avenue. The rectory address is 215 Exeter Street, Brooklyn NY 11235, telephone 718-743-1824.
Note that two Masses are offered each week.
St. Margaret Mary Alacoque (1647-1690) of Burgundy, France, became a Visitation nun. Because of her visions, she encouraged a devotion to Jesus and His Sacred Heart.
In the 2013 Official Catholic Directory for the Ukrainian Catholic Diocese of Stamford, there is a listing for a mission, named in honor of Blessed Nicholas Chernetsky, in Manhattan Beach. A description from 2005 is linked here. In 1956, I first attended a Ukrainian Liturgy in Troy and was awed by the strong participation of the faithful in singing the Byzantine hymns.