The historic Chapel of Our Lady of the Rosary was built in 1906 thanks to the donation of Edward and John Smith of New York City in memory of their sister, Sister Mary Loretta Smith.  It was decorated with Lafarge stained glass windows, Carrara marble altars, oak vaulting, and oak pews.  The Chapel was on the grounds of the Hudson River State Pyschiatric Hospital and served the Catholic hospital staff and patients.  
  The Chapel Masses were offered by the nearby Jesuits of Saint Andrew's Seminary (now the Culinary Institute of America).  Among them was Father Francis P. Rowley, S.J., brother of James Joseph Rowley who began working for the Secret Service in 1938 during the Roosevelt administration.
  In the 1990s, more and more of the State Hospital was being abandoned and plans were being made to sell off land to developers. 
  In 1998, the chapel was still in use.  The Chaplain was Father James LeBar, resident in Regina Caeli in Hyde Park.  Sunday Masses were at 9:00 am and 10:15 am with a Saturday Vigil at 7:00 pm.  Daily Mass from Monday to Friday at 12 noon.   That year, the Archdiocese of New York began negotiations with the State of New York to acquire the chapel and the parish began to celebrate Holy Mass and the sacraments there.   However, the chapel needed much work.
 Parishioners immediately responded by raising funds and volunteering time to restore the chapel.  After Our Lady of the Rosary Chapel had been acquired, it took nine days and nine dumpsters to clean it.  It was then painted, and a heating and air conditioning system was installed for $90,000, three new parking lots (it had only a muddy space for ten cars) for now 110 cars for $100,000, an underground electric line for $60,000, a water drainage line for the parking lots for $60,000, the furnishing of the sanctuary with a baptismal font for $8,000, a pulpit for $8,000, and sanctuary furniture for $5,000 among other additions. It all came from memorial donations for the Chapel’s restoration from many generous souls.  Regular worship began there by the parish on the Solemnity of Sts. Peter and Paul, June 29, 1999.
  On Tuesday, December 12, 2006 St. Peter's parish celebrated the 100th anniversary of the dedication of the Chapel.   By that time, the parish was seeing a revival.  School enrollment rose from 125 students with only three students in the 7th grade in 1998 to over 200 students in 2006.  Parish enrollment increased from 750 worshiping parishioners at five Masses in 1998 to 1500 in 2006, including 300 children, at six Masses, five of which are at Our Lady of the Rosary Chapel.  Numerous non-parishioners from near and far began to request to celebrate sacraments at the parish.  Between 1998 and 2006, Baptisms increased from ten a year to nearly 100; Weddings went from only one or none a year for 35 years to about 20 a year.   The deed to the chapel and surrounding eight acres of land as well as easements to access the chapel from West Cottage Road and Hudson View Blvd. were obtained from New York State by the Archdiocese of New York in 2009.   
  The 400 seat Chapel of Our Lady was the reason for a tremendous increase not only in parishioner population and finances but in the increase in the reception of the Sacraments.  But more importantly this magnificent Chapel has blessed St. Peter’s Parish finally with a consecrated and suitable place to offer the Holy Sacrifice of the Mass in both the Ordinary and Extraordinary Forms.  It provided the parish with a beautiful sacred building for Baptisms, Weddings, First Communions, and Confirmations.  Since then, the Chapel with its traditional architecture, and original high altar and reredos, has drawn many from throughout the region and lifts up their spirit to the Lord at Holy Mass.  
    It is a pious thought to believe that Our Lady of the Rosary desired that this Chapel was preserved for St. Peter’s Parish.  Therefore, let us never cease to honor the name of Mary, Our Lady of the Rosary, by our faithfulmess to our Christian obligations and by praying her Holy Rosary for the salvation of souls, for peace in the world, and that God’s Will be done.