[AnthonyMouse]

> I'm not "so sure", though I think gaming the system with a long term sublet would be pretty unlikely because how likely are you to find a legit tenant who would go through you as the landlord instead of the actual landlord for a luxury rental. It's more complicated than actually living in the unit and then staying with a partner or friend if you can rent it out a few days/week when you can command a good rate.

But it's arbitrage. The market rate is $4000 but the current tenant is paying $1000 and subletting for $3500. The inconvenience is worth $500/month, and you can't just go directly to the landlord to cut a better deal because the apartment is already "occupied" by the tenant paying $1000 who the landlord can't remove.