I really hope that apartment is the worst the world’s got because if not reality’s already fucked.
The Teeth infection could spread to the rats who are basically their own dimension a whole city block sized Rat King floating and growing. The roaches are human level in intelligence. The first floor is a World War I nightmare with cursed hand people fighting forever.
Rafta one cursed tenant could turn the entire building into parts of her own body if left alone. There’s a hellish dimension formed from the body of Sybil who has swallowed people and turned them into organs. Another hydra is spreading but it’s still nothing compared to the fifteen kilometer Caterpillar God on the roof.