Why is Stanley so concerned about belle reve?

Stanley is concerned about Belle Reeve because it represents the ancestral home of Blanche and Stella, and he believes it symbolizes their family's declining status and financial struggles. He is skeptical about the loss of the estate, viewing it as a sign of Blanche's fragility and a potential threat to his domestic life with Stella. Stanley's pragmatic nature and need for control drive his desire to uncover the truth about Belle Reve, which he sees as tied to Blanche's past and the legitimacy of her presence in their lives.