I do not attend here, but I believe it was something like a convent. Nobody seems to know anything about it now, and I believe it was moved and closed.  Mt Carmel Academy moved to the Methodist Church at 7155 Ashburn, and adjacent is 201 Ashburn with a chapel and multi-occupant residential facility.  That facility is now closed and the property is owned by a holding company, but had previous been owned by an episcopal church.  I think this is long gone.