Damage to common property and rubbish left behind by tenants

Hello all,

Im not sure if I have posted this in the right area but here goes.

The tenants of a unit in our block have just moved out leaving a trail of destruction behind. We have had ongoing issues with these tenants and the  Earlier this week one of them reversed into a brick wall and all the way through to the property backing onto us not only destroying our wall but the fence behind it aswell. Im assuming not wanting to deal with the problems caused they have decided to move out and when moving out caused further damage breaking the entrance door windows and dislodging the handrail. They have also left couches and mattresses on common property.

This is not the first time we have had problems with tenants from that particular lot. The lot owner does not care much for his unit and will allow anyone to rent it out. Generally we end up with young tradies rooming together. The lot owner has been advised and warned on numerous occasions about his tenants breaching by laws and the rubbish and furniture they leave behind but he always ignores them.

The last time his tenants left the Owners Corporation payed for everything to be removed and cleaned up. This isn’t fair and the lot owner needs to be accountable for this since he has been negligent in managing his property (he is a real estate agent).

I have instructed the strata agent to issue the lot owner with a notice to fix the issues caused by his tenants and if he ignores the notice then we will go ahead and fix the problems up and then pursue him for the costs. Is this possible?

We do have insurance but I dont think we should be paying the excess or having to make a claim on our policy when the damage is always caused by tenants from the same property. The lot owner has always taken it for granted that the owners corporation will pay for it all so he doesnt worry about it and will just replace the old tenants with new problem tenants. 

Any advice on how to pursue the damage costs and also how to make the lot owner accountable?

Thank you