The heirs to the prominent late Bay Area sports figure Franklin Mieuli continue to feud with the San Francisco 49ers and the York family ownership, suing the team this week over claims it has reneged on decades-old promises to give them ongoing perks such as luxury box seats and Super Bowl tickets.

Peter Mieuli, trustee for his father’s estate, alleges in a Santa Clara County Superior Court lawsuit that the 49ers have refused to abide by contract provisions for those amenities since Franklin Mieuli died in 2010. Mieuli, former owner of the Golden State Warriors, had a stake in the 49ers, and his heirs have been embroiled in a spat with the team over attempts to sell their share for the right price.

The trust sued the 49ers two years ago, accusing the team of lowballing the heirs, who wanted to sell their 5 percent stake in a franchise Forbes magazine has valued at about $1.2 billion. That lawsuit has been tied up in the NFL’s arbitration process, according to court papers.

But now the heirs have sued again, this time alleging the 49ers have refused to honor a 1977 agreement with Mieuli that purports to guarantee eight luxury box seats to home games; eight additional complimentary home tickets for each game; tickets to playoff games, including a first-class airline ticket and “first-class hotel accommodations”; and 10 complimentary Super Bowl tickets.

Bob Lange, a 49ers spokesman, said the team had no comment on the lawsuit, citing a policy against discussing litigation.

The lawsuit does not specify how the agreement might apply to the 49ers new stadium in Santa Clara. Robert Moore, the lawyer for the Mieuli trust, could not be reached for comment.

Howard Mintz covers legal affairs. Contact him at 408-286-0236, or follow him at Twitter.com/hmintz.