The district may undertake separately or jointly with other persons, including a municipality or county in which the district is located, all or part of the cost of an improvement project, including an improvement project:
(1) for improving, enhancing, and supporting public safety and security, fire protection and emergency medical services, and law enforcement in and adjacent to the district; or
(2) that confers a general benefit on the entire district or a special benefit on a definable part of the district.