LDS Building On Course SALT LAKE CITY - Construction crews have completed the installation of more than 6,800 tons of structure steel in the new 30-story LDS Church office building here. Authorities report work on the 800,000 square foot structure on schedule When completed in July 1972, the $31 million facility will be the tallest building in the state. CHURCH OFFICE It will house all offices and departments of the LDS Church except the General Authorities who will continue to occupy the historic church offices at 47 E. South Temple. Steel columns for the tower which rises between two four- story wings are of welded steel plate up to five inches thick weighing up to 936 pounds per foot. Girders are rolled wide flanged structural shapes 24 inches deep weighing 120 pounds per foot. Filler beams are 18- inch deep steel members spaced 10 feet on center Lateral stability of the struc¬ture is provided by a moment resisting frame for the full height of the building in a north- south direction. In the east-west direction diagonal X-bracing is utilized to the 16th floor level with a moment frame from there to the top. A three-level underground parking garage with a capacity for 1,600 cars has been com¬pleted. The tower and its two adjoin¬ing wings will be served by 21 elevators, six of them 1,000-feet per minute highrise type. Elevators will ride on about 82,000 feet of three-eighth, one- half and five-eighth inch eleva¬tor rope. The structure will be faced with 225,000 square feet of white quartzite cast stone from Utah's Park Valley. About 2,650 pieces of stone weighing a total of 9,300 tons will be used on the build¬ing. The most impressive features of the stone work will be mas¬sive replicas of the eastern and western hemispheres. Located on both the north and south sides of the two four-story wings, these bas-relief maps are indicative of the worldwide scope of the church. Windows, which will be shaded by the stone facing panels, are of the pivoting type, glazed with one-inch insulation glass. The exterior is of bronze colored glass. All heating and cooling of the building will be accomp¬lished by a heat pump system supplied by four church-owned wells, each producing 2,500 gal¬lons of water per minute.