Google changed license for Google Map API use. So you need renew keys.
I not know why, but for some accounts Billing info important for some not.
To create your application's API key:
1. Go to the API Console. console.developers.google.com/
2. From the projects list, select a project or create a new one.
If the APIs & services page isn't already open, open the left side menu and select APIs & services.
3. On the left, choose Credentials.
4. Click Create credentials and then select API key.
You need update Key in Real estate manager settings->Administrator Settings->Google Map Options
Regards
Andrew
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