I want a massive city I'm thinking ...

I want a massive city I'm thinking like 700 blocks by 700 blocks circular exterior walls with main roads that run each of the cardinal directions northwest South and east in the center where they meet is a Plaza with a fountain, and the top left section of the city is going to be housing shops and the main barracks and Armory must have access to the main roads. And the top right section of the city is going to be the royal district which has the castle and higher end housing and shops along with the adventurers Guild. And the bottom left there will be a large park that takes up the entirety of the area that has a natural lake and forest there are paths that go around and through the park along the inside of the wall there is a road that wraps the entire area in the bottom right slums