SKWrapper 
A Plasma cutters great for this sort of work. One with its own built in air compressor.
Thats if you intend do be doing a fair amount of work.
Otherwise its either a oxy/acetylene or oxy/propane gas cutting torch.
If you use a angle grinder it would need to be a 9 inch cutoff disc or a larger gas powered demolition cutoff saw.
You can rent a demolition cutoff saw just for one job. If the jobs recycling the steel it would be worth it, or if you are getting paid to remove it.
For the price of scrap steel it would have to weigh a lot.
Find out the hire price anyway, that info is handy & always gives you another option.
[ After edit ] you might as well get the hire place to quote the rental on the plasma cutter too.
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