If the improvements financed by an obligation will be conveyed to or operated and maintained by a municipality or retail utility provider pursuant to an agreement between the district and the municipality or retail utility provider entered into before the issuance of the obligation, the obligation may be in the form of bonds, notes, or other obligations payable wholly or partly from assessments, issued by public or private sale, in the manner provided by Subchapter A, Chapter 372, Local Government Code.