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Future Minimum Base Rents and Future Minimum Lease Payments - Narrative (Details) (USD $)
 1 Months Ended 12 Months Ended
Mar. 31, 2011
Dec. 31, 2014
Aug. 17, 2007
Sunset Gower      
Ground Leases      
Ground lease monthly rent $ 31,000hpp_GroundLeaseMonthlyRent1
/ hpp_PropertySubjectToGroundLeaseAxis
= hpp_SunsetGowerMember		   $ 14,000hpp_GroundLeaseMonthlyRent1
/ hpp_PropertySubjectToGroundLeaseAxis
= hpp_SunsetGowerMember
Ground lease rental rate adjustment period 7 years    
Del Amo      
Ground Leases      
Annual rent   1.00hpp_GroundSubleaseAnnualRent1
/ hpp_PropertySubjectToGroundLeaseAxis
= hpp_DelAmoOfficeMember		  
9300 Wilshire      
Ground Leases      
Minimum annual rent   75,000hpp_GroundLeaseMinimumAnnualRent1
/ hpp_PropertySubjectToGroundLeaseAxis
= hpp_Location9300WilshireBoulevardMember		  
Percent of gross rentals   6.00%hpp_GroundLeasePercentOfGrossRentalsLessMinimumRentIncludedInAdditionalRent
/ hpp_PropertySubjectToGroundLeaseAxis
= hpp_Location9300WilshireBoulevardMember		  
222 Kearny      
Ground Leases      
Minimum annual rent   975,000hpp_GroundLeaseMinimumAnnualRent1
/ hpp_PropertySubjectToGroundLeaseAxis
= hpp_Location222KearnyStreetMember		  
Operating income amount   8,000,000hpp_GroundLeaseMinimumRentOperatingIncomeAmount1
/ hpp_PropertySubjectToGroundLeaseAxis
= hpp_Location222KearnyStreetMember		  
Greater of | 222 Kearny      
Ground Leases      
Minimum annual rent   $ 975,000hpp_GroundLeaseMinimumAnnualRent1
/ hpp_GroundLeaseMinimumRentCalculationAxis
= hpp_MutuallyExclusiveGreaterOfMember
/ hpp_PropertySubjectToGroundLeaseAxis
= hpp_Location222KearnyStreetMember		  
Percent of operating income   20.00%hpp_GroundLeaseMinimumRentPercentOfOperatingIncome
/ hpp_GroundLeaseMinimumRentCalculationAxis
= hpp_MutuallyExclusiveGreaterOfMember
/ hpp_PropertySubjectToGroundLeaseAxis
= hpp_Location222KearnyStreetMember