I would never put a rooftop garden
in the
warzone ghetto — it's likely that either 1) what tenants growing is not edible, at least not food edible 2) some tenant will get drunk and / or violent and fall off the roof and sue the OP or 3) it will be a
place where vagrants, drunks, thugs, and lowlifes congregate and either hurt themselves, someone else, or cause some sort of issue for the OP (noise, fights, parties, drugs, violence, juvenille delinquents, skateboarding off the roof, domestic violence, you name it).