Vacant property attracts a specific set of problems: metal and cable theft, squatting, fly-tipping, arson and the slow damage that follows a broken window nobody noticed for a fortnight.
The financial exposure is usually larger than owners expect. Insurance on unoccupied property is conditional, and those conditions frequently require documented inspections at defined intervals. A claim can fail on the absence of a patrol record rather than on the loss itself.
A visible security presence changes the calculation for anyone assessing the building, and a documented patrol regime protects the position with your insurer at the same time.