It's still unclear exactly how much money Cruz has access to and how much, if anything, he'll get from his mother's estate, ABC said.
In addition, his mother, who died from a respiratory illness, received an annuity of $3,333 in September to an account she shared with Nikolas.
Finkelstein also said that if Cruz's inheritance, should he be entitled to it, is paid out in monthly installments, the total funds could amount to a million dollars.
Among the matters to be settled by the probate court include determining what assets exist and how to divide them among the brothers.
Nikolas Cruz also has a life insurance check for $25,000 and a bank account with a few hundred dollars, the lawyer said.
He was in court on Wednesday for a hearing to determine whether the public defender's office representing him should be dismissed if he can afford a private attorney.
Since he was arrested on February 14 in the killing of 17 people at the Florida high school, information has surfaced that he might stand to inherit a small fortune.
Cruz will be back in court again on April 27.
His mother, Lynda Cruz, died November 1, leaving Nikolas Cruz with $25,000 from a life insurance policy, Broward County Public Defender Howard Finkelstein said in the hearing.
Under Florida law, a public defender can charge a client even after the case is over, Miami-Dade Circuit Judge Scott Silverman told The Miami Herald. If Cruz retains the public defenders and it's determined at a later date that Cruz has money, the office could be reimbursed.
He stands accused of 17 counts of premeditated murder and 17 counts of attempted murder. He's being held without bail in a Broward County jail.
If convicted of murdering 17 people, Cruz could face the death penalty.
Whatever his worth, Finkelstein said, Cruz would like whatever money isn't used on his defense donated to a cause that promotes healing and education in the community.