A parking lot...
I see, yeah...
A Parking lot is a fate I would not wish upon the worst of modern or brutal buildings, that is just horrific. I also understand you feelings about "Something we can never get back" because that is exactly what gets to me about so many of the buildings lost in the 60's and 70's.
Looking at the picture you gave, it reminds me of a similar hospital in my home of Phoenix Az, "Good Sam's"
Now I don't LIKE that hospital, I think it is, well, abit ugly. But it's still 'ours' and I know it is one of a kind. If someone said they wanted it torn down I'd fight to protect it.
So I guess we can find common ground here. History is what we can not get back, and that applies to many many buildings now. Especially sicne what is built in it's place, if anything, is often unimaginative and bland.
I think the construction world as a whole needs some sort of '"Law of Equal Exchange" IE, you can't just take down one building if you are just leaving an empty lot in it's place, whatever replaces it must be an improvement.
Imagine if the world followed that? We would no longer need fear a historical treasure being replaced by a Wal-Mart.