Leasehold buildings insurance cover is provided by Zurich Municipal. Remember that you must make a claim within 90 days of the incident. Subletting: If you wish to sublet your property you must inform Home Ownership otherwise your insurance may be affected. If you submitted a claim to Ocaso - who were the previous buildings insurance provider - through their loss adjusters DMS, you should continue to deal with them. Ocaso will see through all the live claims for incidents that took place up to and including 31 March 2013.