I have check the assessors records and I estimate the total acreage owned or controlled by "Lourdes" is about 18.11 acres. This includes the property that the old hospital is on and the large vacant areas heading to St. Julien. The 18.11 acres includes the satellite parking garage on St. Patrick Street. Lourdes DOES NOT OWN any property fronting St. Mary Street. Once the hospital is demolished the only thing standing (to my understanding) on the Lourdes property will be the two parking towers.
18.11 acres is 788,871 square feet. Placing a square foot value on the raw land is not what I do so I don't know. Maybe a real estate pro on this board can take a guess. I would GUESS that the value of the two parking towers would be between 3.5 to 4.0 million. 788,871 square feet at $x.xx per square foot plus 3.5 or 4.0 million would be the value of the property. The only question would be what is the property "worth" to a potential buyer and if the owner is willing to sell at that price.
I don't have the time right now but I will draw up a map and post it later.