google are now policing one phone number per entry in an account.
Each account for a user with several income streams or a multiple-occupancy location will have the same mail address.
It is accepted practice to put a unique qualifier at the start of address line 2 such as 'Suite 123, ', 'Unit 321, ' or 'Gandalf House, '. It is probably a good idea to register that at the post office if possible.
google are also tightening up on address format, or your old listing was set up before a Mapping source change:. You also need to ensure the Maps red Pin position in your Places entry is in the same position as your other Web content as far as possible. If they differ google may create a pesky duplicate(s) Maps listing for you otherwise. I am using a free web site where it will only position at the post code 'centre' OWHY so when its picked up in Maps I may have a problem.
If you have a suburb or main road you can put in an empty address line 2 then try it contingent on google still positioning the Pin correctly. Not all suburb names appear on Maps so checkout yours first and maybe choose the nearest most applicable if need be.