To dream of Manhattan represents social interaction with other people where you are so far better off that you don't have to do anyone a favor. Noticing you're better than others while an entire situation revolves around your decision-making power. Not having to do anything except notice your own power. Being the leader of a situation where you have the freedom to cut off anyone you want to their face.
Negatively, Manhattan may reflect abusing your power to stay in total control of a social situation. Abusing power for the purpose of simply never being told what to do.
Example: A man dreamed of seeing Manhattan being destroyed by an asteroid. In waking life he was in total control of his dead mothers estate and realized that one day he'd eventually have to sell her house because he couldn't do anything to stop it. Manhattan reflected his interaction with relatives whom he had total power over as he managed the estate while having to answer to no one.
*Please See New York City