I am a realtor in Bethlehem. I am very familiar with that development as I live and work in that area. I did a quick check and did not find any available units for rent in those condos presently. There are four that are for sale. I could keep my eye open if one becomes available. There are also some other alternatives in that area that I think might work for you.
If you would like my assistance, I can be reached at 484-554-3797 or at Lehighvalleyrealtor@yahoo.com.
Prudential Patt, White Real Estate
http://www.trulia.com (Rentals Section)
http://www.zillow.com (Rentals Section)
http://www.realtor.com (Rentals Section)
Between all of those, you will get a very clear picture if you can find what you are looking for. Good luck!