Lawyers for a Rockland man and his sister say the state sold off their property for far less than what it was worth, despite their efforts to save it. The property in Rockland and Owls Head belonged to William Dean, Junior and Claire Dean Perry.Perry is suing the Department of Health and Human Services and a division of Key Bank, according to her lawyer, Cynthia Dill. Last year, Dean was sent to a state mental health hospital and the state obtained control of his finances. Dill says the state was trying collect $7,500 in back taxes on the family’s homes in Rockland and Owls Head. Dill says Perry and other family members offered to come up with the money, but DHHS officials quickly sold the Owls Head property for about $200,000, less than half its assessed value.Dill says personal items were also auctioned off and Dean’s pet cat was even euthanized. Dill says the case will most likely go to mediation next. DHHS officials say they can’t comment on pending lawsuits.