A Yishun resident has successfully monetised his unit’s chronic ceiling seepage by rebranding his living room as a premium eco-friendly rainforest retreat.

The relentless brown drip from the upstairs toilet is being hailed as a triumph of modern HDB architectural fluidity.

“Eh, last time I complain Town Council for years also no use, now I just collect ticket money, okay?” owner Tan Ah Kow remarked while selling ponchos to tourists.

“Wait for the upstairs uncle to pang sai then the waterfall got extra organic smell, damn authentic one, like real jungle vibe.”

HDB inspectors have officially classified the structural failure as a cost-effective way to cool the island without wasting electricity.

Property agents suggest the toxic mouldy stalactites will add $200,000 to the resale price because of the unique 'natural cave' aesthetic.