A crowded tenement is read as pressure, lack of space and lives pressed close together. Dream books also see in it resilience and the solidarity of people who share hardship.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.