Block insurance (including houses afaik), refuse, street lighting, landscaping, common area cleaning and lighting (only shared entrance apartments benefit but we all have to pay), caretaker.....those are the things that I can think of off the top of my head.
We have the problem that our leases are structured so we pay based on unit size rather than type so basically everyone else subsidises the services that the shared door apartments get. We have looked into it ad nauseum and that can't be changed. It would have been helpful if our solicitor had explained it but didn't so we're stuck with it. Still we have a really nice development so it's six of one and half a dozen of the other.