Important! Much of this post is contradicted by what I observed on 9.21.2019. Please look at this update.
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The photographs below are from 2009. On August 8, 2015, I passed this church and did not notice any sign that it was closed, even though the Archbishop merged this parish with Holy Rosary parish. Regular Mass and sacraments will not be available here, but rather at Holy Rosary - Nativity, on Eastchester Road near Gun Hill Road, where Father Dennis Williams is pastor of the combined parish. However, some Mount Vernon Catholic churches may also be handy for displaced parisioners. Historically this borderland of The Bronx has had strong ties to Mount Vernon. Maybe most of the houses within Nativity parish (under the old parish-boundaries protocol) are, in fact, in Mount Vernon. The Bronx side of the border, with Nativity church and school and the Dyre Avenue subway station is more commercial and industrial.
Nativity of Our Blessed Lady church stands at the southwest corner of East 233rd Street and Secor Avenue. The far side of the church, that is, facing Secor Avenue, has some windows. 
The address of the parish school is 3893 Dyre Avenue, Bronx NY 10466, telephone 718-324-2188.
See pages 484 and 485 for the foundation of the parish of the Nativity of Our Blessed Lady near Dyre Avenue and East 233 Street in the Eastchester neighborhood of The Bronx.
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Though the parish dates from 1924, a first church was completed in 1933, according to a parish history at this link. The church burned in 1958, and in 1969 the new church was inaugurated at the corner of Secor Avenue and East 233rd Street. For many years since the parish school's opening in 1953, the Dominican Sisters of Newburgh educated youngsters of Nativity. The school is at 3893 Dyre Avenue, telephone 718-324-2188. It appears that the school has one section per grade, as it graduated about thirty students in June, 2009. In September, 2019, it is actively recruiting students both for Universal Pre-Kindergarten (UPK, a municipal program) and the K-8 school.
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The name Eastchester dates back to the late 1600's, it seems, but the Town of Eastchester shrunk as cities and villages were carved from it. This northern neighborhood of The Bronx is correctly called Eastchester, but the remaining Town of Eastchester lies about six miles north. Church and school are near the Dyre Avenue terminus of the 5 Train of the New York City subway.
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A comment follows:
michael said...- "I grew up in the north Bronx. entered Nativity school the 1st year it opened. In fact, I have the program when Cardinal Spellman dedicated the school. I also was an altar boy when the church was on Secor Avenue. In fact, I served the last mass there on the day it burnt down. I also have a photo of my baptism that shows the lawn where the playground now is or was."
