Accessory parcel (carpark) to Condo - can the JMB build on my car park

I own an additional accessory parcel of car park in my condo making my car parks 3 contiguous units.
The JMB decided to build a barrier on the lot of one of the car parks (to manage the traffic flow) without informing me nor asking for my permission. 

Can I sue them for trespassing? If I take them to court  (to get them to demolish the barrier) should I file a case at the Magistrate or Tribunal?

Maybe it would be less of a hassle and cheaper to just demolish the barrier yourself.