Thanks for your prompt reply.
The owners are absentee landlords who resist any expenditure on their property that they consider unnecessary, such as lawn replanting/feeding, deck maintenance.
The foliage is within their property and whilst it may encroach on (or rather, through common property – a brush perimeter fence) it could be technically be an issue for the neighbours to deal with also insofar as it encroaches on to their land.
Another issue is that the bamboo is producing spikes which extend 15m+ high thus spoiling views and restricting sunlight for other owners.
in practice we could ask the body corporate contract gardener to do the work, which would please the tenants, but don’t see why the rest of us should pay for it!