Add cash to 1031 exchange

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I am considering selling one or all of my properties in order to get into the multi-family business.  On certain deals if I assume that I need 25% down, I could exchange one property I have and add a bit of cash to make it work - but I don't know if the adding-cash part can be done.  I did some searches through older forums but didn't come across an answer.  Any thoughts?