4300 Grand Ave., the nearly 100-year-old red brick mansion that is currently home to the Humphrey Law Firm, has been sold for its $600,000 asking price.

The buyer is Don Beattie, a Pleasant Hill attorney who intends to practice law there with his son, who is currently in law school, according to Marc Humphrey.

The sale marks the third time in the last six months that one of the mansions along Grand Avenue has changed hands. Humphrey is leaving the nearly 8,000-square-foot home for bigger pastures: He was the buyer of the nearly 10,000-square-foot Crawford Mansion, located several blocks down the street at 2203 Grand Ave. Handling both transactions was Sharpe Gibbs Commercial Real Estate Services.

Humphrey has had his eye on the Crawford Mansion for years. He first had an opportunity to buy it during his second year out of law school. But the building was in relatively poor shape then and needed more renovation work than Humphrey thought he could pour into it, he said.

Still, that didn’t stop him from taking a picture of the building and writing the name of his young law firm underneath it, as if his practice was based there. It was a sort of prediction of the future.

Now, things are different. Money management firm IMG has outgrown the Crawford Mansion, and has spent plenty of money fixing it up.

As for 4300 Grand, Humphrey has spent more than $50,000 on renovations himself, according to Tim Sharpe. The main house has 4,700 square feet of finished space and another 3,000 square feet in the basement and a third level that is unfinished. There is a 1,750-square-foot carriage house behind the main building.

The mansion, which has a striking green roof, “has a tremendous presence on Grand Avenue,” Sharpe said.