The announcement says the Mass in the convent chapel will be led by the RC Archbishop of Baltimore .. so I would assume part of the Mass would be the consecration of the chapel, as part of accepting them into ‘full communion with the Holy See.”
I really don’t know, but I would imagine ownership of the property is more likely that of the Order than the Episcopal Diocese in Baltimore.
Just like one would think that churches built by Anglican parishes that existed prior to the formation of the dioceses they were later incorporated into would take their church property with them when they left the episcopal church.... But they have not (California, Colorado, etc.)