Officers said the rapper told the man some encouraging words, which allowed the situation to end peacefully.
Police said it doesn't appear the two men knew each other. T.I. was just happy he could help save the man's life.
"With the help of the negotiators and them allowing me to help, we sent him a message. I let him know that I was here and I was willing to help him, and he came down peacefully and everything was resolved," said the rapper.
T.I. is due in court Friday for a parole hearing after being arrested on suspicion of drug offenses in September in Los Angeles.
He is on supervised release after spending a year in prison on federal weapons charges.