Because they are too old, unable for people to live in, the area is needed for something better, or even out of style.
they are demolished because it's foolish to build buildings near a river and it will surely be destroyed
Is it ghetto?
Yes, it can be (as in demolished buildings). The word demolished is the past tense and past participle of the verb (to demolish) and is used as an adjective to mean knocked down or destroyed.
yes they should
Approximately 30,000 buildings were fully destroyed; buildings with partial damage that had to be demolished counted for some 68,000.
45%
Some examples are: I have demolished my house. I have demolished this toy.
There are thousands of buildings in Dublin, and new ones being built all the time and also some being demolished, so your question is impossible to answer definitively as it would change constantly.
Yes, as long as they are still in good condition. In fact, old bricks from demolished buildings is an incredibly chic architectural trend these days.
60%
Is it ghetto?
well if their buildings were demolished... you'd be pretty smart to say that they weren't