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Investment in Real Estate - Purchase Price Allocation for Acquisition (Details) (USD $) | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 06, 2014 | Feb. 12, 2014 | Feb. 28, 2014 | Oct. 17, 2014 | May 22, 2013 | Jun. 14, 2013 | Jul. 31, 2013 | Sep. 26, 2013 | Apr. 05, 2012 | Jun. 02, 2012 | Sep. 05, 2012 | Sep. 21, 2012 | Nov. 08, 2012
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 113,580,000 us-gaap_PaymentsToAcquireBusinessesGross | $ 389,883,000 us-gaap_PaymentsToAcquireBusinessesGross | $ 392,320,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Receivable |  | 4,000,000 hpp_BusinessCombinationsCostofAcquiredNotesReceivable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Assumed | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred | 102,299,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest in consolidated real estate entity | 0 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion | 45,704,000 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion | 1,481,000 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | 113,580,000 us-gaap_BusinessCombinationConsiderationTransferred1 | 541,886,000 us-gaap_BusinessCombinationConsiderationTransferred1 | 393,801,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net | 114,008,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet | 538,322,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet | 390,370,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet |  |  |  |  |  |  |  |  |  |  |  |  |
Above-market leases | 173,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAbovemarketLeases |  | 167,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAbovemarketLeases |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred leasing costs and lease intangibles, net | 3,163,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredLeasingCostsandLeaseIntangibles | 34,256,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredLeasingCostsandLeaseIntangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leases in place |  |  | 16,099,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLeasesinPlace |  |  |  |  |  |  |  |  |  |  |  |  |
Other lease intangibles |  |  | 4,072,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherLeaseIntangibles |  |  |  |  |  |  |  |  |  |  |  |  |
Fair market unfavorable debt value |  | (5,820,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFairMarketUnfavorableDebtValue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Below-market leases | (3,315,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases | (22,449,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases | (16,018,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases |  |  |  |  |  |  |  |  |  |  |  |  |
Other (liabilities) asset assumed, net | (449,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet | (2,423,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet | (889,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration paid | 113,580,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet | 541,886,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet | 393,801,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |  |  |  |  |  |  |  |  |  |  |  |
EOP Northern California Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  | 1,750,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_EOPNorthernCaliforniaPortfolioMember |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property |  |  |  | 8,200,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = hpp_EOPNorthernCaliforniaPortfolioMember |  |  |  |  |  |  |  |  |  |  |  |
Equity consideration |  |  |  | 63,474,791 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = hpp_EOPNorthernCaliforniaPortfolioMember |  |  |  |  |  |  |  |  |  |  |  |
Merrill Place |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | 57,034,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_MerrillPlaceMember |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  | 57,034,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_MerrillPlaceMember |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  | 57,508,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_MerrillPlaceMember |  |  |  |  |  |  |  |  |  |  |
Above-market leases |  |  |  |  | 173,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAbovemarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_MerrillPlaceMember |  |  |  |  |  |  |  |  |  |  |
Deferred leasing costs and lease intangibles, net |  |  |  |  | 3,163,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredLeasingCostsandLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_MerrillPlaceMember |  |  |  |  |  |  |  |  |  |  |
Below-market leases |  |  |  |  | (3,315,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_MerrillPlaceMember |  |  |  |  |  |  |  |  |  |  |
Other (liabilities) asset assumed, net |  |  |  |  | (495,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_MerrillPlaceMember |  |  |  |  |  |  |  |  |  |  |
Total consideration paid |  |  |  |  | 57,034,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_MerrillPlaceMember |  |  |  |  |  |  |  |  |  |  |
3402 Pico Blvd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  | 18,546,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_SantaMonica3402PicoBoulevardMember |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  | 18,546,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_SantaMonica3402PicoBoulevardMember |  |  |  |  |  |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  | 18,500,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_SantaMonica3402PicoBoulevardMember |  |  |  |  |  |  |  |  |  |
Above-market leases |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAbovemarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_SantaMonica3402PicoBoulevardMember |  |  |  |  |  |  |  |  |  |
Deferred leasing costs and lease intangibles, net |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredLeasingCostsandLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_SantaMonica3402PicoBoulevardMember |  |  |  |  |  |  |  |  |  |
Below-market leases |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_SantaMonica3402PicoBoulevardMember |  |  |  |  |  |  |  |  |  |
Other (liabilities) asset assumed, net |  |  |  |  |  | 46,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_SantaMonica3402PicoBoulevardMember |  |  |  |  |  |  |  |  |  |
Total consideration paid |  |  |  |  |  | 18,546,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_SantaMonica3402PicoBoulevardMember |  |  |  |  |  |  |  |  |  |
12655 Jefferson |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | 38,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_A12655JeffersonMember |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  | 38,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_A12655JeffersonMember |  |  |  |  |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  |  | 38,000,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_A12655JeffersonMember |  |  |  |  |  |  |  |  |
Above-market leases |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAbovemarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_A12655JeffersonMember |  |  |  |  |  |  |  |  |
Deferred leasing costs and lease intangibles, net |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredLeasingCostsandLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_A12655JeffersonMember |  |  |  |  |  |  |  |  |
Below-market leases |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_A12655JeffersonMember |  |  |  |  |  |  |  |  |
Other (liabilities) asset assumed, net |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_A12655JeffersonMember |  |  |  |  |  |  |  |  |
Total consideration paid |  |  |  |  |  |  | 38,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_A12655JeffersonMember |  |  |  |  |  |  |  |  |
3401 Exposition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  | 8,489,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Notes Receivable |  |  |  |  |  |  |  | 4,000,000 hpp_BusinessCombinationsCostofAcquiredNotesReceivable / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Debt Assumed |  |  |  |  |  |  |  | 13,233,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Non-controlling interest in consolidated real estate entity |  |  |  |  |  |  |  | 0 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  | 25,722,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  |  |  | 25,439,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Deferred leasing costs and lease intangibles, net |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredLeasingCostsandLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Fair market unfavorable debt value |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFairMarketUnfavorableDebtValue / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Below-market leases |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Other (liabilities) asset assumed, net |  |  |  |  |  |  |  | 283,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Total consideration paid |  |  |  |  |  |  |  | 25,722,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_Location3401ExpositionMember |  |  |  |  |  |  |  |
Pinnacle II |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  | 1,505,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Notes Receivable |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationsCostofAcquiredNotesReceivable / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Debt Assumed |  |  |  |  |  |  |  |  | 89,066,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Non-controlling interest in consolidated real estate entity |  |  |  |  |  |  |  |  | 45,704,000 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  | 136,275,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  |  |  |  | 134,289,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Deferred leasing costs and lease intangibles, net |  |  |  |  |  |  |  |  | 12,637,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredLeasingCostsandLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Fair market unfavorable debt value |  |  |  |  |  |  |  |  | (5,820,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFairMarketUnfavorableDebtValue / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Below-market leases |  |  |  |  |  |  |  |  | (7,783,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Other (liabilities) asset assumed, net |  |  |  |  |  |  |  |  | 2,952,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Total consideration paid |  |  |  |  |  |  |  |  | 136,275,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIIMember |  |  |  |  |  |  |
Seattle Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  | 368,389,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
Notes Receivable |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationsCostofAcquiredNotesReceivable / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
Debt Assumed |  |  |  |  |  |  |  |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
Non-controlling interest in consolidated real estate entity |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  | 368,389,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  |  |  |  |  | 367,094,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
Deferred leasing costs and lease intangibles, net |  |  |  |  |  |  |  |  |  | 21,619,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredLeasingCostsandLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
Fair market unfavorable debt value |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFairMarketUnfavorableDebtValue / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
Below-market leases |  |  |  |  |  |  |  |  |  | (14,666,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
Other (liabilities) asset assumed, net |  |  |  |  |  |  |  |  |  | (5,658,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
Total consideration paid |  |  |  |  |  |  |  |  |  | 368,389,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_SeattleAcquisitionMember |  |  |  |  |  |
1861 Bundy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  | 11,500,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
Notes Receivable |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationsCostofAcquiredNotesReceivable / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
Debt Assumed |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
Non-controlling interest in consolidated real estate entity |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  | 11,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  |  |  |  |  |  | 11,500,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
Deferred leasing costs and lease intangibles, net |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredLeasingCostsandLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
Fair market unfavorable debt value |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFairMarketUnfavorableDebtValue / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
Below-market leases |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
Other (liabilities) asset assumed, net |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
Total consideration paid |  |  |  |  |  |  |  |  |  |  | 11,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_Location1861BundyMember |  |  |  |  |
10900 Washington |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  | 2,605,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_Location10900WashingtonMember |  |  |  |
Non-controlling interest in consolidated real estate entity |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion / us-gaap_BusinessAcquisitionAxis = hpp_Location10900WashingtonMember |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  |  | 2,605,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_Location10900WashingtonMember |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  |  |  |  |  |  |  | 2,600,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_Location10900WashingtonMember |  |  |  |
Above-market leases |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAbovemarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_Location10900WashingtonMember |  |  |  |
Leases in place |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLeasesinPlace / us-gaap_BusinessAcquisitionAxis = hpp_Location10900WashingtonMember |  |  |  |
Other lease intangibles |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_Location10900WashingtonMember |  |  |  |
Below-market leases |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_Location10900WashingtonMember |  |  |  |
Other (liabilities) asset assumed, net |  |  |  |  |  |  |  |  |  |  |  | 5,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_Location10900WashingtonMember |  |  |  |
Total consideration paid |  |  |  |  |  |  |  |  |  |  |  | 2,605,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_Location10900WashingtonMember |  |  |  |
901 Market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  | 90,871,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_Location901MarketMember |  |  |
Non-controlling interest in consolidated real estate entity |  |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion / us-gaap_BusinessAcquisitionAxis = hpp_Location901MarketMember |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  | 90,871,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_Location901MarketMember |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  |  |  |  |  |  |  |  | 97,187,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_Location901MarketMember |  |  |
Above-market leases |  |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAbovemarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_Location901MarketMember |  |  |
Leases in place |  |  |  |  |  |  |  |  |  |  |  |  | 2,968,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLeasesinPlace / us-gaap_BusinessAcquisitionAxis = hpp_Location901MarketMember |  |  |
Other lease intangibles |  |  |  |  |  |  |  |  |  |  |  |  | 548,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_Location901MarketMember |  |  |
Below-market leases |  |  |  |  |  |  |  |  |  |  |  |  | (10,249,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_Location901MarketMember |  |  |
Other (liabilities) asset assumed, net |  |  |  |  |  |  |  |  |  |  |  |  | 417,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_Location901MarketMember |  |  |
Total consideration paid |  |  |  |  |  |  |  |  |  |  |  |  | 90,871,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_Location901MarketMember |  |  |
Element LA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,436,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_OlympicBundyMember |  |
Non-controlling interest in consolidated real estate entity |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion / us-gaap_BusinessAcquisitionAxis = hpp_OlympicBundyMember |  |
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,436,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_OlympicBundyMember |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,024,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_OlympicBundyMember |  |
Above-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAbovemarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_OlympicBundyMember |  |
Leases in place |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,325,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLeasesinPlace / us-gaap_BusinessAcquisitionAxis = hpp_OlympicBundyMember |  |
Other lease intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_OlympicBundyMember |  |
Below-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  | (666,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_OlympicBundyMember |  |
Other (liabilities) asset assumed, net |  |  |  |  |  |  |  |  |  |  |  |  |  | (293,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_OlympicBundyMember |  |
Total consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,436,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_OlympicBundyMember |  |
1455 Gordon Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,385,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_Location1455GordanStMember |
Non-controlling interest in consolidated real estate entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion / us-gaap_BusinessAcquisitionAxis = hpp_Location1455GordanStMember |
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,385,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_Location1455GordanStMember |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,384,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_Location1455GordanStMember |
Above-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAbovemarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_Location1455GordanStMember |
Leases in place |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLeasesinPlace / us-gaap_BusinessAcquisitionAxis = hpp_Location1455GordanStMember |
Other lease intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_Location1455GordanStMember |
Below-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (27,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_Location1455GordanStMember |
Other (liabilities) asset assumed, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (90,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_Location1455GordanStMember |
Total consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,385,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_Location1455GordanStMember |
Pinnacle I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208,023,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIMember
Non-controlling interest in consolidated real estate entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,481,000 hpp_BusinessAcquisitionCostOfAcquiredEntityNonControllingInterestPortion / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIMember
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 209,504,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIMember
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,175,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedRealEstateInvestmentPropertyNet / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIMember
Above-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 167,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAbovemarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIMember
Leases in place |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,710,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLeasesinPlace / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIMember
Other lease intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,456,000 hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherLeaseIntangibles / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIMember
Below-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,076,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowmarketLeases / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIMember
Other (liabilities) asset assumed, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (928,000)hpp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIMember
Total consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 209,504,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hpp_PinnacleIMember
Office Building | EOP Northern California Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired |  |  |  | 26 us-gaap_NumberOfRealEstateProperties / us-gaap_BusinessAcquisitionAxis = hpp_EOPNorthernCaliforniaPortfolioMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember |  |  |  |  |  |  |  |  |  |  |  |
Development Parcel [Member] | EOP Northern California Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired |  |  |  | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_BusinessAcquisitionAxis = hpp_EOPNorthernCaliforniaPortfolioMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = hpp_DevelopmentParcelMember |  |  |  |  |  |  |  |  |  |  |  |

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