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If that 240k is per flat it’s insanely high, if it’s across all flats in the block it’s a bargain. The value of the freehold is usually based on the net present value of the future cash flows from the ground rents across the block. If you look at your lease you can get an idea of what that might be for your flat at least, then multiply by the number of flats. You need to take into account any ratchets towards the end of the lease term.
Isn't there legislation to force freeholders to sell to residents at an affordable rate?