Mobile & Ohio Railroad machine shops, Prichard, Ala.

Stapleton Airport hangar, Denver (Lawrence Walsh, Colorado Preservation, Inc.)

LOST 1854 Mobile & Ohio Railroad machine shops, Prichard, Ala.: long brick building with open arcades and raised skylight was state's oldest surviving railroad building; demolished this winter after efforts to clean up soil contamination failed

1906 Studebaker plant, Detroit: four-story warehouse used by Studebaker for many years in city's New Center area, the nucleus of automobile companies and suppliers in industry's early days, destroyed in spectacular June blaze

GOING, GOING ... 1964 Busch Stadium, St. Louis: last of a generation of elliptical multipurpose stadiums used for professional baseball and football; baseball's Cardinals will play next season in new vintage-style ballpark

RESTORED 1901 Healdsburg Inn, Healdsburg, Calif.: 12-room hostelry facing town plaza received seismic upgrade and restoration of trim, molding, and sealed windows and fireplaces; opened in August after six-month renovation

SAVED c. 1790 Robert Preston House, Washington County, Va.: descendants of Revolution-era surveyor recently sold county's oldest frame structure to developer with plans to build shopping center on site; in May, city of Bristol donated land half-mile away for relocation and restoration of house as museum

1959 Stapleton Airport hangar, Denver: developer of vast residential neighborhood at site of former international airport in process of conveying diamond-shaped Hangar 61 to local businessman, who hopes to create offices inside

THREATENED c. 1910 Kootenai Lodge, Lake County, Mont.: lodges, dining halls, and cabins remain at former retreat for mining barons; Florida developer plans to demolish several structures and alter others to build condominiums, boat slips, a pool, and roads

1907 Klotz Throwing Co. silk mill, Lonaconing, Md.: closed in 1957 but not dismantled, still contains original machinery and country's largest collection of silk documents; leaky roof and offers to buy old-growth timber beams, pillars, and flooring now jeopardize the site