Web API from Presentation Layer

I have 2 sample Projects in solution file 1. Presentation Layer using MVC Razor View Engine 2. MVC Web API for database interaction. Right now I am deploying the Web API on localhost under port 83 and Presentation Layer under Port 84. Drawback of this way will be to use 2 domains. One for Presentation Layer and anther for Web API I tried to create the Virtual Directory but I am getting 404 error when I tried to run directly Web API url to get JSON data for checking if the URL are working or not.