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I underestimated slightly - it's £7k for repairs and £16-20k to get the lease extended (it's currently at 66 years).
But it's not the money in isolation - it's the fact that I'd feel mugged off paying a cumulative £220k when flats in this block tend to go for £175k-£180k WITHOUT work required. I don't mind paying a bit over the odds to get in but that feels excessive, esp when this flat has been on the market for six months already.
I know £20k is a lot of money, but just bear in mind how much you may spend while looking for somewhere else. I don't know your personal circumstances, but I was spending £18k a year with my girlfriend on our old flat.
What's the £20k for - a new roof?