Anything under 65 years is generally considered to be short...
Most mortgage companies want 40 years to be left on the lease once you have reached the end of your mortgage, which are normally 25 years. This therefore means that anything under 65 years on a lease is generally considered short. This doesn't mean you can't buy a property with say 50 years left on the lease and taking a 10 year mortgage. But there may well be a problem trying to sell it when the lease is now only 40 years or so. There are a few exceptions to these rules but they tend to be in the very upper end of the market.
