XML 57 R42.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Mortgage Notes Payable (Parenthetical) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017
Executive Office Park [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate Terms | Interest rate is subject to reset on July 1, 2018. |
Fixed interest rate on mortgage (in hundredth) | 5.80% | [1],[2]
Grand Pacific Center [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate Terms | Interest rate is subject to reset on September 1, 2023 |
Fixed interest rate on mortgage (in hundredth) | 4.02% | [2],[3]
Model Home Properties [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Fixed interest rate on mortgage (in hundredth) | 3.80% |
Model Home Properties [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Fixed interest rate on mortgage (in hundredth) | 5.50% |
[1] | Interest rate is subject to reset on July 1, 2018.
[2] | Interest rates as of December 31, 2017.
[3] | Interest rate is subject to reset on September 1, 2023

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=sqft_ExecutiveOfficeParkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=sqft_GrandPacificCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=sqft_ModelHomePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |