Summary Accounting Policies (Policies)	9 Months Ended
Summary Accounting Policies (Policies)	Sep. 30, 2015
Summary Accounting Policies
Principles of Consolidation/Basis of Preparation	Principles of Consolidation/Basis of Preparation The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and include all of the information and disclosures required by U.S. Generally Accepted Accounting Principles (“GAAP”) for interim reporting. Accordingly, they do not include all of the disclosures required by GAAP for complete financial statement disclosures. In the opinion of management, all adjustments necessary for fair presentation (including normal recurring accruals) have been included. The results of operations for the three and nine months ended September 30, 2015 are not necessarily indicative of the results for the full year. These statements should be read in conjunction with the consolidated financial statements and related notes included in OLP’s Annual Report on Form 10-K for the year ended December 31, 2014. The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The consolidated financial statements include the accounts and operations of OLP, its wholly-owned subsidiaries, its joint ventures in which the Company, as defined, has a controlling interest, and variable interest entities (“VIEs”) of which the Company is the primary beneficiary. OLP and its consolidated subsidiaries are hereinafter referred to as the “Company”. Material intercompany items and transactions have been eliminated in consolidation.
Variable Interest Entities	Variable Interest Entities The Financial Accounting Standards Board, or FASB, provides guidance for determining whether an entity is a VIE. VIEs are defined as entities in which equity investors do not have the characteristics of a controlling financial interest or do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties. A VIE is required to be consolidated by its primary beneficiary, which is the party that (i) has the power to control the activities that most significantly impact the VIE’s economic performance and (ii) has the obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. Additionally, the Company assesses the accounting treatment for any interests pursuant to which the Company may have a variable interest as a lessor. Leases may contain certain protective rights such as the right of sale and the receipt of certain escrow deposits. In situations where the Company does not have the power over tenant activities that most significantly impact the performance of the property, the Company would not consolidate tenant operations.
Investment in Joint Ventures	Investment in Joint Ventures The Company assesses the accounting treatment for each joint venture investment. This assessment includes a review of each joint venture or limited liability company agreement to determine the rights of each party and whether those rights are protective or participating. The agreements typically contain certain protective rights such as the requirement of partner approval to sell, finance or refinance the property and to pay capital expenditures and operating expenditures outside of the approved budget or operating plan. In situations where the Company and its partner, among other things, (i) approve the annual budget, (ii) approve certain expenditures, (iii) prepare or review and approve the joint venture’s tax return before filing, and (iv) approve each lease at a property, the Company does not consolidate the joint venture as the Company considers these to be substantive participation rights that result in shared power over the activities that most significantly impact the performance of the joint venture. The Company accounts for its investments in unconsolidated joint ventures under the equity method of accounting. All investments in these joint ventures have sufficient equity at risk to permit the entity to finance its activities without additional subordinated financial support and, as a group, the holders of the equity at risk have power through voting rights to direct the activities of these ventures. As a result, none of these joint ventures are VIE’s. In addition, although the Company is the managing member in certain ventures, it does not exercise substantial operating control over these entities, and therefore the entities are not consolidated. These investments are recorded initially at cost, as investments in unconsolidated joint ventures, and subsequently adjusted for their share of equity in earnings, cash contributions and distributions. None of the joint venture debt is recourse to the Company, subject to standard carve-outs.
Properties Held for Sale	Properties Held-for-Sale Real estate investments are classified as held-for-sale when management has determined that it has met the applicable criteria. Real estate investments which are held-for-sale are not depreciated.
Tenant Reimbursements	Tenant Reimbursements Tenant reimbursements represent tenants’ contractual obligations for recoverable real estate taxes and operating expenses and are recognized when earned.
Reclassifications	Reclassifications Certain amounts previously reported in the consolidated financial statements have been reclassified in the accompanying consolidated financial statements to conform to the current period’s presentation.

Disclosure of accounting policy for consolidation to describe the significant judgments and assumptions made in determining whether a variable interest held by the entity requires the variable interest entity to be consolidated and (or) disclose information about its involvement with the variable interest entity; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; and the significant factors considered and judgments made in determining that the power to direct the activities that significantly impact the economic performance of the variable interest entity are shared (as defined).

- Definition

Disclosure of accounting policy for the equity method of accounting for investments in common stock or other interests including unconsolidated subsidiaries, corporate joint ventures, noncontrolling interests in real estate ventures, limited partnerships, and limited liability companies. The accounting policy may include information such as: (1) initially recording an investment in the stock of an investee at cost; (2) adjusting the carrying amount of the investment to recognize the investor's share of the earnings or losses of the investee after the date of acquisition; and (3) adjustments to reflect the investor's share of changes in the investee's capital (dividends). This disclosure may also include a detailed description of the policy for determining the amount of equity method losses recognized after an investment has been reduced to zero as a result of previous losses, reasons for not using the equity method when the investor company owns 20 percent or more of the voting stock of the investee's company (including identification of the significant investee), reasons for using the equity method when the ownership percentage is less than 20 percent, and discussion of recognition of equity method losses when an investor's total investment in an investee includes, in addition to an investment in common stock, other investments such as preferred stock and loans to the investee. An entity also may describe how such investments are assessed for impairment.

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