We still install cast Iron Pipes???

Yes.

I have roughed-in a number of apartment buildings (in Edmonton) that have cast iron drainage pipes (Even in the odd commercial building).

Recently, we received a phone call from a homeowner renovating his house.  He wanted to replace his stack that he had uncovered in a wall.  Figuring that it was old and plastic was better, he wanted an estimate.  I said that there is nothing wrong with cast iron stacks as long as they are not cracked or leaking.

IN FACT, they are quieter than plastic drainage pipe (especially when someone is flushing the toilet on a floor above you).

If you are thinking of buying a condo apartment (and you don't do well with noise), ask whether the building has plastic drainage pipe or cast iron.

READ this article at:  Why You Need to Specify Cast Iron Plumbing for Your Home

OH! and I almost forgot...

Remember, if you or anyone else (a certified journeyman plumber) "alter" any drainage pipe in your home you need a city permit.