The website of Most Holy Trinity parish seems down, but the Facebook page is HERE. The parish address is 138 Montrose Avenue, Brooklyn NY 11206, telephone 718-384-0215.
The AIA Guide suggests that Most Holy Trinity church may have been inspired by the Abbaye aux Hommes in Caen, Normandy. The street view looks east on Montrose Avenue. The second view looks east from Lorimer Street, across the two ballfields of Frances Hamburger Sternberg Park to the church. A link to the Abbaye aux Hommes here.
The parish website gave a history of the parish school, which closed in 2013.