SINGAPORE (EDGEPROP) - The sale of a five-bedroom unit at Clementi Park, a 796-unit condo in District 21, was the most profitable transaction during the week of Sept 10 to 17. The 3,401 sq ft, ground-floor unit changed hands for $3.34 million ($983 psf) on Sept 12. It had been bought for $1.46 million ($429 psf) in 2001. Thus, the seller walked away with a profit of $1.88 million (129%), or an annualised profit of 5% over 18 years.