Hi,
I am sharing answer given by Miriam Ellis (a moz staff) on exact query.
"In order to qualify for local inclusion, avoid penalties and prevent merging, your client must be able to answer yes to the following 3 points.
1) Does the business have a unique, dedicated physical address (not a virtual address, P.O. Box or shared address)?
2) Does the business have a unique, dedicated local phone number in the city of location (not an 800 number, not a call tracking number, not a shared number)
3) Does the business have in-person transactions with its customers, either at its own location (like a restaurant) or at the customers' locations (like a plumber)?
If the business does not meet any one of these 3 criteria, it does not qualify for local inclusion. I don't know where your client is at on points 2 and 3, but if they can't say yes to point one, Local SEO will be nothing but problematic for them. Here's why:
If 2 or more businesses share an address, suite address or phone number (or even if their names are too similar), Google will frequently merge the business details of the listings. This means that Joe the Barber can end up with Jim the Plumber's business name, phone number or reviews showing up on his listing. Merging is one of the most difficult issues to deal with in Local, and one to be avoided at all costs.
Here is a Google help file on this issue: http://support.google.com/places/bin/answer.py?hl=en&answer=175290
Your client's best hope is to:
1. Secure a unique suite number in the building at which he/she works and at which mail can be received.
2. Search for all citations of the business web-wide to correct any existent citations so that they include the new suite number.
You can check full post here @ http://moz.com/community/q/local-seo-how-to-handle-multiple-business-at-same-address
Hope this helps
Thanks