I'm always a bit reluctant to wade into discussions about other CPAs because I do not know all the facts, but based solely on what you entered in your original post, your accountant is wrong. But, there could be other reasons you cannot take the rental loss (primarily passive activity or basis limitations), so you might want to question your CPA more. Perhaps the two of you are miscommunicating.
Expenses related directly to the rentals are deducted on schedule E--not as itemized deductions on schedule A. Usually, properties on schedule E that are rentals are passive income. With some exceptions (like publicly traded partnerships), all of your passive income is netted. If the net result is a loss, your net loss will have to be carried forward to next year. As mentioned by @Thomas DeVoe (Thomas, I went to Homewood a lot when I was a child into early 20's--loved that area), you may be able to deduct up to $25,000 of passive activity losses IF you actively participate in the rental properties and your Adjusted Gross Income is not too high.
I cannot think of a situation where you BOTH cannot deduct the losses this year AND you cannot carry them over either.
Another possibility: your CPA does not agree that you have rental properties but rather that the properties are personal (ie, second, third, etc. homes). If he is trying to deduct the property taxes on schedule A (which would be correct in this case), and the standard deduction is more than your itemized deductions (of which, in this case, the property taxes would be one), you would use the standard deduction instead of your actual deductions.
Sorry I got so long-winded here--I feel like this is basic knowledge for a CPA and there must be a miscommunication between the two of you.