Residential block in Chicago not zoned for multiple families?

I hope someone can help me out here. I live in Chicago on a single family residential block. There's a fireman who owns a house next to me and he rents it out to three different parties. Basement, first, and second floor. He has young 20 somethings living there and they party, smoke, and drink all the time and create lots of mess. The parking situation on the block is grim to say the least since they all have multiple junker cars that take up lots of space on the block. They have a back area to park in, however, the building owner has an uncovered jalopy of a boat in the backyard that the neighborhood children all play on (back yard isn't completely fenced in, so the kids play in the boat all the time.) There is a giant black willow or "weed tree" as we call it that drops leaves all year long in my neat back yard and whenever there is a storm, my backyard is littered in twigs and branches. More than one occassion in the last 5 years has left me without power since the tree branches knocked out my power. The homeowner refuses to take care of the property, cut the tree branches, and address the litter issue with his tenants. Do I have any rights here? I don't want to be forced out of my home and have to move because of a slum lord. I don't believe that the block is even zoned for multiple family homes. Please does anyone have any advice?