If you sell it within a year, it is actually taxed as ordinary income. Over one year, it is taxed as a capital gain-20%(thanks President Bush). So, whether or not the taxes are more depends on how many writeoffs you have against your current year income, and then of course, what your current income level is. So, if your current income less deductions puts you at a weighted average tax rate of less than 20%(which isn't out of the question considering where industry pay is going), then sell it now. If it's over 20%, then wait til after a year...more importantly though...sell it when the selling is good. I'm not sure real estate is gonna be to good for the next 5-7 years...at least at the macro level...there will always be good values in individual markets.
(used to know this stuff pretty well before I chased my dream of wearing pajamas to work, and flying military planes).