where do most puerto ricans live in NY? and where do most dominicans live?

I do understand that all of New york are majority puerto ricans and domincians but i was just wondering where in like New york city is the heart of where they all live ? for example most mexicans probably live in a certain area in LA as to which a certain area in LA is for blacks and whites and asians . oh and another question do puerto ricans and dominicans feel like rivals and are they kind of alike in a way such as culture? Thanks for any info