Remove steel framed windows from concrete house

As the title suggests, I need to remove and replace a couple of steel framed casement windows from a concrete Housing Commission house for a customer.
I'm a chippie and have replaced or installed heaps of windows but I've never had to do one of these before, most of the Commission houses around here get bulldozed and the ones that don't rarely have the windows replaced.
Anyway, I was wondering if anyone here had done some and could give me some tips on the easiest way to pull them out, I'm thinking I'll just attack it with a side grinder.
Any help will be much appreciated.


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