What difference does it make to a valuation if a lease is 99yrs or 990yrs? Lease is owned 50/50 by the upper and lower apartments of a previously 1930s semi and is offerred free of charge together with the sale
According to above most modern leased are only 99 years and value of property begins to drop at 80years and difficult to get a mortgage on property from 60 years.
http://www.lease-advice.org/calc/
This one has a calculator to help you get an idea of costs to extend lease.