LLC that holds rentals and flips

[Chris Adams]

I hold my rental properties in my LLC, recently I flipped a house that purchased Oct 2013 and sold March 2014.

My Accountant as told me that if I flip a short term hold property that is held in the LLC that holds my rentals, this would disallow me to claim rental income as passive income.

He told me if this was not a regular situation he could work around it. But If I planned on doing a flip to title that property in my other S corp not the LLC that holds the rentals.

Is his advice correct?