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Statements of Income (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
RENTAL REVENUES $ 805,693us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 766,434us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 737,724us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
EXPENSES      
General and administrative 103,252us-gaap_GeneralAndAdministrativeExpense 80,024us-gaap_GeneralAndAdministrativeExpense 76,329us-gaap_GeneralAndAdministrativeExpense
Depreciation 28,948us-gaap_Depreciation 28,948us-gaap_Depreciation 28,948us-gaap_Depreciation
Total expenses 132,200us-gaap_OperatingExpenses 108,972us-gaap_OperatingExpenses 105,277us-gaap_OperatingExpenses
Operating income 673,493us-gaap_OperatingIncomeLoss 657,462us-gaap_OperatingIncomeLoss 632,447us-gaap_OperatingIncomeLoss
OTHER INCOME      
Interest 283us-gaap_InvestmentIncomeInterest 263us-gaap_InvestmentIncomeInterest 250us-gaap_InvestmentIncomeInterest
Other 3,750us-gaap_OtherNonoperatingIncome 1,150us-gaap_OtherNonoperatingIncome 1,465us-gaap_OtherNonoperatingIncome
Net income $ 677,526us-gaap_NetIncomeLoss $ 658,875us-gaap_NetIncomeLoss $ 634,162us-gaap_NetIncomeLoss
Net income per limited partnership unit (Note 2) $ 76.65dtrpi_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicBeforeTax $ 74.54dtrpi_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicBeforeTax $ 71.74dtrpi_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicBeforeTax
Number of limited partnership units used in computing per unit amounts 8,751us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding 8,751us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding 8,751us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding