Hello
Google changed license for Google Map API use. So you need renew keys.
To create your application's Google map 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. There Please add all your sites names with "http", "https", "
www", without "
www", ...
4. Click Create credentials and then select API key.
5. Add to your API support Geocoding
You need update Key in Real estate manager settings->Administrator Settings->Google Map Options
Regards
Andrew