If you live on the west side first floor, it may be a good idea to put door alarms on your windows and on the sliding door. You can get the magnetic battery operated door alarms at a Dollarama for 1$. You just stick them to the side of the window or door and on the window or door and switch them on. Then when someone moves the door or window an alarm sounds. The sound is just strong enough to alert you and to the scare a would-be intruder.
The Marina Center has a bad reputation and has had some nastly tenants, including drug dealers and professional ladies, so if you move into this complex you should be aware that you will need extra protection and good insurance.