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Condensed Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Accumulated amortized leasing costs $ 1,023,673 $ 996,614
Accumulated amortized mortgage financing costs 1,659,457 1,580,197
Participation units outstanding 720 720
Participation unit, par value $ 5,000 $ 5,000