On the issue of subleasing, I had an apartment where the tenants decided every now and then to holiday abroad and sublease the premises via Air B&B, without telling me or telling the OC.
I had no idea it was sublet.
That said, even if I was aware, I would not bother with the details of the sub-lessee because the lease imposes obligations on the tenant (or “head tenant” as some call them). A short term sub-lessee would leave long before wheels were in motion to alert him to a breach of by law or common decency.
The head lessee’s contact details were always with the OC.
The most effective solution IMHO is to make clear to the “head tenant” that in the event of leasing the premises in whole or in part for a period that falls within the duration of the “head tenant’s” lease, that the “head tenant” will be responsible for the conduct (and consequences) of her guests, sub tenants etc.
Our OC was happy with that solution, if for no other reason than sub lessees are often short stayers and providing their contact details to the OC or strata agent is superfluous when (a) ALL correspondence was sent electronically to the “head tenant” who could if she wished, forward such information to its sub lessee; and (b) chasing sub tenants up for damage etc after they have scooted away is also a fruitless endeavour. Both the landlord and OC can hold the “head lessee” accountable for the omissions and commissions of its subtenants.