Opponents of the 8-month-old Montrose Management District are now claiming they have collected enough signatures to dissolve the entity. Created in February from the combination of the East Montrose Management District and the recently established Harris Country Improvement District No. 11, the new district is one of several such organizations given taxing authority by the state legislature; its assessments and security, business development, transportation, and visual improvement projects are aimed at the approximately 1,400 commercial and multifamily properties in the area bounded roughly by Shepherd, West Dallas, Taft St. and Spur 527, and the Southwest Fwy. (also included: a small portion of the Museum District east of Boulevard Oaks). Stop the District organizers say creation of the district required the signatures of only 25 property owners, but that their dissolution petition has been signed by property owners representing more than 75 percent of the property value in the area.