File 830 Park Ave., Specs., archival: In: William Muschenheim papers, 1923-2004 (majority within 1951-1985) » Project Files » Job 19, 830 and 840 Park Avenue » [Apartments, 830 Park Avenue (New York, N.Y.). Alterations] » Papers
File Specs. 11B, 830 Park Ave., archival: In: William Muschenheim papers, 1923-2004 (majority within 1951-1985) » Project Files » Job 19, 830 and 840 Park Avenue » [Apartments, 830 Park Avenue (New York, N.Y.). Alterations] » Papers
File Specs. & Estimates, 8A, 830 Park Ave., archival: In: William Muschenheim papers, 1923-2004 (majority within 1951-1985) » Project Files » Job 19, 830 and 840 Park Avenue » [Apartments, 830 Park Avenue (New York, N.Y.). Alterations] » Papers
File Contracts, orders, 11B, 830 Park, archival: In: William Muschenheim papers, 1923-2004 (majority within 1951-1985) » Project Files » Job 19, 830 and 840 Park Avenue » [Apartments, 830 Park Avenue (New York, N.Y.). Alterations] » Papers
File Prints photographs showing interior views 3 items In: William Muschenheim papers, 1923-2004 (majority within 1951-1985) » Project Files » Job 19, 830 and 840 Park Avenue » [Apartments, 830 Park Avenue (New York, N.Y.). Alterations] » Papers
File Contracts, orders, Apt. 8A, 830 Park Ave. archival: In: William Muschenheim papers, 1923-2004 (majority within 1951-1985) » Project Files » Job 19, 830 and 840 Park Avenue » [Apartments, 830 Park Avenue (New York, N.Y.). Alterations] » Papers
Container Photographs Box 10 In: William Muschenheim papers, 1923-2004 (majority within 1951-1985) » Project Files » Job 19, 830 and 840 Park Avenue » [Apartments, 830 Park Avenue (New York, N.Y.). Alterations]
Container [840 Park Avenue (New York, N.Y.). Alterations] Online In: William Muschenheim papers, 1923-2004 (majority within 1951-1985) » Project Files » Job 19, 830 and 840 Park Avenue
File [Typical floor plan for apartment types "A" and "B"]. This is page 76 from the Douglas Elliman Locator Online In: William Muschenheim papers, 1923-2004 (majority within 1951-1985) » Project Files » Job 19, 830 and 840 Park Avenue » [840 Park Avenue (New York, N.Y.). Alterations] » Drawings, #.00270V, .00288-.00294, January 22, 1934, June 20, 1940
File [1st floor, north apartment, showing partial plan, partial elevation, and a section] / Louis A. Hornum, R.A., January 22, 1934. Online In: William Muschenheim papers, 1923-2004 (majority within 1951-1985) » Project Files » Job 19, 830 and 840 Park Avenue » [840 Park Avenue (New York, N.Y.). Alterations] » Drawings, #.00270V, .00288-.00294, January 22, 1934, June 20, 1940