redcali

There is some good and poor advice in this thread so far.

Let me begin the following by saying I don’t disbelieve what you are saying at all and don’t want any of the below to put you offside at all. I have been involved in a number of similar incidents, all with different causes and solutions.

First, You should be making a record of all instances you are referring to. Each time he is in the car park when you are and a brief note about what he’s doing. Each time he’s in the garden and what he’s doing (and whether or not he does it anywhere else other than outside your unit). A comprehensive record will always assist you in these sorts of situations with other agencies.

Have you approached this person at all about their behaviour? A solution could be as simple as a confrontation. The person may not be aware of how overt their behaviour is and being called out on it could help reduce it significantly. It is a step you will be asked if you have already tried in a lot of the follow up process available to you.

Try breaking up your routine a little. If your work allows for earlier/later starts and finishes try that for a little while.
Depending on the layout of your complex, you could try find a single unit carpark on another level that’s normally vacant and approach the unit occupant about borrowing it for a while. Most people would be sympathetic to your plight.

You should look at security cameras. Most manufacturers have wireless units which you’ll have no issues using. I don’t know what the circumstance of the Pedophile situation above was but there is no crime in having a camera in your unit facing out to your balcony and the street.

In respect to personal security. There is a new app on Iphones called ‘Shortcuts’ and specifically on shortcuts there is a function that allows for automated turning on of the phone camera. Developed primarily for US traffic stops, the function allows for you to handsfree turn on your phone and send a copy of the recording to a third party. It is an excellent personal security feature. More info here https://www.businessinsider.com.au/ios-12-shortcut-uses-iphone-to-record-police-during-traffic-stop-2018-10?r=US&IR=T

In relation to the police. As you have surmised, the police will be reluctant to do anything because nothing done so far is a crime. Old mate weirdo is allowed to do everything and be everywhere you have described and until he oversteps, will continue to be able to do so.
I would recommend you go and speak with them though. A good time to attend generally is mid morning and mid evening (8 to 10 am and pm). Go to your local station. Speak with and officer there and let them know what is occurring. They will likely advise at first instance to do the above and are entirely unlikely to make any sort of record of the interaction. Grab their contact info though and when the problem persists, get in touch again with the same officer and make a time to see them. Unfortunately there isn’t exactly a standard course of action here so I couldn’t advise as to what they might do going forward. If you have already confronted them, they might be far more likely to attend and have a conversation with the person as well.

Threatening/implying/inferring complaints is entirely unlikely to result in positive action on your behalf and isn’t something I would recommend at a time when the described situation doesn’t require police to act for you. Police get in trouble for not investigating crimes. As outlined above, There does not appear to be a crime committed. So  complaining is likely to result in your name being mud at your local station and the officer complained about not having anything happen because, they weren’t required to do anything.