[draker]

Probably, just not secured to prevent people from entering. The complaint is likely that the property is a nuisance and/or hazard due to failure to properly secure the building/property (it doesn't help that the building/container wasn't permitted).

If you own abandoned property you are usually required to board up windows/doors or otherwise prevent people from entering as well as place no trespassing signs on the property.

For permitted active residential construction you can usually get by with construction fencing and no trespassing signs.

It doesn't seem like he is actively developing or living in the property; more or less just using it as a occasional getaway.