maintenance fees

This is a general question, not related to any particular development or area, but can anyone provide insight re: the differences or similarities in maintenance fees for large buildings (at least 40 apartments) and maintenance fees for brownstone condos? I have seen brownstone condos with 2 or 3 units charge higher monthly maintenance fees than really large buidlings (the larger buildings have doormen, supers, etc., so the fees make more sense to me). I simply do not understand the high fees for brownstone condos. It can't cost that much to keep lights on the stairway, can it? Appreciate any info!