Pay future prices today. Is it worth it?

453sf unit on 13th floor for RM600k (RM1324psf). With 6% Guaranteed rental returns over 12 months.
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640sf unit across the road at Seri Bukit Ceylon selling below RM600k (RM930psf) can be rented out at RM3500 per month (though not easy).
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What do you think?

http://realtymalaysia.blogspot.com/2011/09...kit-ceylon.html