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All the previous answers are good ones. If you do not like or agree with the simple answers like asking your agent, going to the county tax records or reviewing a previous appraisal, you can always have another appraisal done.
You probably have an appraisal when you bought your home check that one again and if you believe that your home is 2200sqft have your own appraisal and you can write the correct sqft to your marketing tools.
Both Nanci and Chris had excellent suggestions. Here are some additional things to consider:
1) Does 2200 sq. ft. represent the total square footage, and 1500 sq. ft. the living area (heated/cooled space)?
2) In the original listing, was there a room, such as a glassed-in porch, that had a window/wall air conditioner, and which may have been included in the living area by the previous agent?
3) Was there an unpermitted addition included in the previous square footage?
I'm sure you and your agent will get to the bottom of this. Good luck.
Maggie Hawk, REALTOR
Watson Realty Corp.