The bulletin of the combined parishes a few years ago said that Mass is offered Monday to Friday at the convent of the Missionaries of Charity, 34 Aberdeen Street, telephone 718-443-2868. (I cannot confirm this in 2017.) Sunday at 11 a.m. a bi-lingual Mass is offered at 89 Furman Avenue.
For an excellent capsule history of the parish, please see McNamara's Blog, linked here. The parish of St. Francis de Sales was established in 1872 and renamed Our Lady of Lourdes in 1897. For many decades, it was staffed by the Fathers of Mercy, a missionary and preaching congregation. That may be one reason for the the large size of the rectory.
As of 1.5.2017, I'm uncertain about the accuracy of the above description of the property. Please note this Brownstoner article dated 1.4.2017 on the construction of 63 affordable apartments in the convent.