You sure 700psf? For sure it is not true. Was told close to 900psf

I'm not working with Sunway neither property agent nor staff. Sunway property really has their standard up to par.  We always emphasise on "location, location & location.  Those who bought Sunway Velocity Residences on first phase really big winner.  Low density, FREEHOLD, direct link to Velocity Mall, just downstairs.
My friend told me that during VP, Sunway staff will make sure everything is clean, they even installed lighting bulbs with low voltage in every units, every door knob tide up with red ribbons.  Red carpet all the way from management office to lift at facilities floor.  Very details developer.  They even provide disposable shoes for purchaser to wear. 

I had seen many developers after VP or before VP, the conditions is really bad, dirty, like really rushing to VP.

I think westhen answered your question: Sunway can sell higher because better enviroment and layout.  I was there yesterday to scout around. Sunway Velocity is kind of like a mini city: upcoming medical centre, shop lots, shopping centre etc. Plenty of amenities and conveniences around. Maybe for an extra rm100 psf, you might think it's worth it. But, I think better to rent than to buy. Not investment grade...yet