You and all your neighbours residing in the same block/estate have a duty (under your leases or transfers of part) to fulfil certain obligations. These can extend to all sorts of things, but most commonly will include placing buildings insurance, keeping the inside and outside common areas clean and tidy, ensuring the building and grounds are kept in a good state of repair, and ensuring you comply with all the company law and health and safety legislation which your company has to abide by. We use the service charge you pay to do all of this (and a lot more!) on your behalf.