I rented my condo through a realtor last summer. My condo was trashed . I kept the security deposit. Is it worth legal action to recover addition $

Is the amount of damage beyond the security deposit?  You can file a claim in small claims court and try to do it on your own.  You should know ahead of time where the person is now living, did they pay you by check that you could attach an asset, how do you thin you will get paid?  All of those questions will be outstanding and you will have to weigh it out.  Also - look at the agreement you signed with the realtor.  Did the realtor agree to screen people?  And get you a good tenant?  and the realtor didn't do that?  then you may also have a claim against the realtor.