Google will realize if there are multiple businesses at one location(you can tweak the address appearance, by adding punctuations in address lines to make the same address appear differently.It can work if you are lucky! ).You can still use the address as long as you can provide one of these , visiting/ID card of employee with the shared address or business invoice with the shared address on it or registration/license docs of business at that address. One of my friends have 3 business(diferent niche) at same location since 1 year in Australia.She managed with a employee ID card. (Sometimes the city/state and the category/niche your targeting is also important.)