Mont. Code Ann. § 7-14-4704

When the public interest or convenience requires, the governing body of a municipality may construct improvements on public streets that have been or will be established as a pedestrian mall, including but not limited to paving, sidewalks, curbs, sewers, covered walkways or areas, air conditioning, drainage works, street lighting facilities, fire protection facilities, flood protection facilities, water distribution facilities, vehicular parking areas, retaining walls, landscaping, tree planting, statuary, fountains, decorative structures, benches, restrooms, child-care facilities, display facilities, information booths, public assembly facilities, and other structures, works, or improvements necessary or convenient to serve members of the public using such pedestrian mall, including the reconstruction or relocation of existing municipally owned works, improvements, or facilities on such streets. The improvements or structures may be attached to abutting private buildings or structures provided that the improvements or structures are located on public property.