There is no whole number open address available, since this sits between existing 302 & 304. The address of this business and project will have to be 304 A.
Please add some sort of building identifier (1, 2, 3, etc) to each building.
When you go to pull permits at the county, please use the address 304 A, and then just list what building number you are applying for with each permit. You will need to pull 1 permit for each building.