CONDENSED BALANCE SHEETS [Parenthetical] (USD $)	Jun. 30, 2011	Mar. 31, 2011
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	22,000,000	22,000,000
Units of limited partnership interest, issued	21,996,102	21,996,102
Units of limited partnership interest, outstanding	21,994,302	21,994,302
Series Fifteen
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	22,000,000	22,000,000
Units of limited partnership interest, issued	3,870,500	3,870,500
Units of limited partnership interest, outstanding	3,870,500	3,870,500
Series Sixteen
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	22,000,000	22,000,000
Units of limited partnership interest, issued	5,429,402	5,429,402
Units of limited partnership interest, outstanding	5,427,602	5,427,602
Series Seventeen
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	22,000,000	22,000,000
Units of limited partnership interest, issued	5,000,000	5,000,000
Units of limited partnership interest, outstanding	5,000,000	5,000,000
Series Eighteen
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	22,000,000	22,000,000
Units of limited partnership interest, issued	3,616,200	3,616,200
Units of limited partnership interest, outstanding	3,616,200	3,616,200
Series Nineteen
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	22,000,000	22,000,000
Units of limited partnership interest, issued	4,080,000	4,080,000
Units of limited partnership interest, outstanding	4,080,000	4,080,000