Ability to Connect or Merge a Google+ Business page to a map listing is now available.

Google is now allowing the transfer of Google+ Local pages

Found in the Places For Business help section. The following has been released:

A note: This feature seems to be limited to certain pages only.

Connect a page to Google Maps

Choose your status:

If you’ve never created a page for your local business, follow these steps to create your local page and verify it so that it’s eligible to appear on Google Maps.
If you’ve created a local page but it isn’t showing up, make sure you’ve verified it. Your edits won’t be eligible to appear on Maps until you do so.
If it’s still not displaying, contact us.

If you created a page in Google+ of a type other than Local business or place, and you’ve been hoping to connect that page to Google Maps and get reviews, follow the steps below.
This process will connect your current page to Google Maps and apply the business information (address, reviews, and more) from Google Maps to your page. The followers, posts, and managers of your page will be retained.
Make sure the business meets our quality guidelines before connecting it to Google Maps. The change will permanently affect some of the information on your page, so be sure that the move makes sense for your business.

In order to connect your page to Maps:

1. If you haven’t already, create a separate local Google+ page--verified on Google Maps--for the same business as your page.
2. Log in to Google+, select Pages from the left-hand navigation ribbon, and click Manage this page on the local page.
   

                             Current page                                               Local page created in step 1
   • The local page will look almost the same as your current page. It will include a verification shield next to the name of a page. If you hover the badge, you’ll see "Verified local business".
3. From the top left corner, choose Dashboard >   Settings
4. Scroll to the "Profile" section. Next to “This page is connected to Google Maps”, click Connect a different page.
   
5. In the "Link a different page to this location" dialog, pick the page that you’d like to connect to Maps and click Next.
6. You’ll see a list describing the changes to the newly-created page you’re connecting to Maps, and the local Google+ page you’re disconnecting from Maps. Click Confirm.
   

                Page now connected to Maps                               Local page created in step 1

The page that’s newly connected to Maps will:

• Display the name and verification badge from the former local page.
• Display the business information (hours, phone number, etc.) and reviews from the former local page.
• No longer display prior owner responses to local reviews. Your existing reviews may take a few hours to show up after connecting the page.
• Retain your page's followers, posts, and managers. 
• Retain the custom URL (if you’ve set one up).
• Possibly remove ad campaigns associated with the page. To start a new campaign, visit http://www.adwords.google.com/express and follow the step-by-step instructions.

The former local page will:

• No longer display on Google Maps
• No longer display local business information or reviews
• Be renamed to "Backup of <page name>"
• Still be visible on Google+
• Retain followers, posts, and managers from the former local page
• Retain the custom URL from the former local page (if you’ve set one up)
• No longer display AdWords Express campaigns associated with the page.

If you’d like to delete the former local page entirely, follow these steps.