I find Ty Burrell’s charactor on “Modern Family” to be more believable (“Phil Dunphy, Realtor“).
But for the record, easily the longest running TV realtor would be Evelyn Harper on “Two and a Half Men,” played by the wonderful Holland Taylor (also Tom Hanks’ boss on the show where he got his start, “Bosom Buddies”).
While I don’t know anyone in the business who reminds me of Evelyn, one episode actually did anticipate a real-life home Seller’s nightmare: their Realtor using their vacant home for — shall we say — “trysts” (see, “Did real estate agent play while owner was away?” in the Star Trib this Summer).
On “Two and a Half Men,” the guilty parties were Alan Harper and his girlfriend, and the situation was (predictably) treated humorously rather than as the felony it really is.