M J Mapp manages all the multi-let properties in the Greenhills property portfolio including office buildings in Horley, Fareham, Bracknell, Solihull and Redhill. Greenhills also owns Croxley Green Business Park, Watford, which is the largest single-ownership business park in south east England. M J Mapp is working closely with Greenhills to redefine the business park to create an energy-efficient space within an environmental and sustainable community and to offer an unparalleled level of service to occupiers.