How to subscribe my property calendar with Google Calendar

First check How To Get The Public URL For The Property Calendar.

To sync with your Google Calendar, please load Google Calendar - https://www.google.com/calendar/  

1. Beside "Other calendars" on the left hand side, click "+" 
2. On the drop down menu, click "From URL"
   
   
   
3.  On the "URL of calendar" field, paste the Public iCal Calendar link of the property
4. Click "Add calendar"
   
   
   
   
   
5. You will now be subscribed to the availability of this property and see the calendar you added under "Settings for other calendars".  You can configure the settings on the right as needed.
   
6. Go back to the main calendar page and you should now see the events for this property. If you open the event you will see that only the basic information is provided on the public iCal.