Exhibit 99.1

News Release

Inquiries: Jeanne Leonard, Liberty Property Trust, 610.648.1704

Liberty Property Trust Announces Third Quarter 2017 Results

Company Also Enters Into $900 Million Credit Facility

Malvern, PA — October 24, 2017 — Liberty Property Trust (NYSE: LPT) announced financial and operating results for the quarter ended September 30, 2017.

Highlights for Third Quarter 2017

·                  Net income available to common shareholders $0.40 per diluted share

·                  NAREIT Funds from Operations $0.66 per diluted share

·                  Same store operating income increased by 2.6% over prior year quarter

·                  Same store operating income for the industrial portfolio increased by 4.3%

·                  Portfolio occupancy increased to 95.9%

·                  Industrial rents increased 14.8%

·                  Office rents increased 12.6%

·                  $98.7 million in development delivered

Earnings Guidance

·                  Liberty increased Funds from Operations guidance range for 2017 to be $2.54 - $2.57 from a previous range of $2.49 - $2.55

·                  Guidance range for 2017 industrial same store NOI revised to 3 — 3.5% from previous range of 2 — 3%

·                  Liberty now expects dispositions for 2017 to be in a range of $400 - $550 million. Fourth quarter dispositions are expected to be in the $380 - $530 million range, with the majority closing late in the quarter.

Financial Results

Net income: Net income available to common shareholders for the third quarter of 2017 was $59.5 million, or $0.40 per diluted share, compared to $54.3 million, or $0.37 per diluted share, for the third quarter of 2016.

For the nine months ended September 30, 2017, net income available to common shareholders was $154.0 million, or $1.04 per diluted share, compared to $161.4 million, or $1.10 per diluted share, for the first nine months of 2016.

Funds from Operations: The company uses the National Association of Real Estate Investment Trusts (“NAREIT”) definition of Funds from Operations (“FFO”) as an operating measure of the company’s

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financial performance.  A reconciliation of U.S. GAAP net income to NAREIT FFO is included in the financial data tables accompanying this press release.

NAREIT FFO available to common shareholders for the third quarter of 2017 was $99.2 million, or $0.66 per diluted share, compared to $99.6 million, or $0.66 per diluted share, for the third quarter of 2016.

NAREIT FFO available to common shareholders for the nine months ended September 30, 2017 was $288.1 million, or $1.91 per diluted share, compared to $294.8 million, or $1.96 per diluted share, for the first nine months of 2016.

Management Comments

“Our results for the quarter and the year to-date reflect a continued strong and sustainable market for high-quality industrial properties,” said Bill Hankowsky, chief executive officer. “The combination of significant user demand, manageable new supply, and the ongoing evolution of supply chain dynamics is creating constant opportunities to capitalize on our versatile portfolio of distribution facilities and multi-tenant industrial properties in prime locations.

“We believe this environment will produce favorable results for industrial for the foreseeable future, and we intend to fund increased investment in our industrial platform through meaningful sales of office properties, reflected in the guidance update provided today.”

Operating Performance

Same Store Performance: Property level operating income for same store properties increased by 3.0% on a cash basis and by 2.6% on a straight line basis for the third quarter of 2017, compared to the same quarter in 2016.  For the nine months ended September 30, 2017, property level operating income for same store properties increased by 1.7% on a cash basis and by 1.6% on a straight line basis, compared to the same period in 2016.

·                  Same store operating income for the industrial portfolio increased by 5.2% on a cash basis and 4.3% on a straight line basis, compared to the same period in 2016. For the nine months ended September 30, 2017, industrial same store operating income increased by 3.2% on a cash basis and 3.0% on a straight line basis, compared to the same period in 2016.

·                  Same store operating income for the office portfolio decreased by 7.7% on a cash basis and by 5.3% on a straight line basis, compared to the same period in 2016. For the nine months ended September 30, 2017, office same store operating income decreased by 6.1% on a cash basis and by 5.3% on a straight line basis, compared to the same period in 2016.

Occupancy: At September 30, 2017, Liberty’s in-service portfolio of 100 million square feet was 95.9% occupied, compared to 95.6% at the end of the second quarter of 2017. During the quarter, Liberty completed leasing transactions totaling 5.9 million square feet of space.

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·                  Occupancy of Liberty’s 93.4 million square foot industrial portfolio was 96.3% at quarter-end, compared to 95.9% for the previous quarter. Industrial distribution rents increased 14.8% on renewal and replacement leases signed during the quarter.  100% of these leases have built-in rent escalators.

·                  Occupancy of Liberty’s 6.7 million square foot office portfolio was 91.0%, down from 91.5% from the previous quarter. Office rents increased 12.6% on renewal and replacement leases signed in the office portfolio, and 94.4% of these leases contain built-in rent escalators.

Real Estate Investments

Development Deliveries: In the third quarter, Liberty brought into service six development properties for a total investment of $98.7 million. The properties contain 994,545 square feet of leasable space and were 54.2% leased and yielding 3.7% as of the end of the quarter. The projected stabilized yield for these properties is 8.0%. The properties are 74.9% leased on a signed basis as of October 24, 2017.

Development Starts: In the third quarter, Liberty began development of three distribution properties totaling 308,892 square feet of leasable space at a projected investment of $29.4 million. The properties consist of:

·                  A build-to-suit at 1806 Highway 146 South, LaPorte, TX, 77,892 square feet

·                  2980 Green Road, Greer, SC, 94,500 square feet

·                  1955 TW Alexander Drive, Durham, NC, 136,500 square feet

Acquisitions: During the third quarter, Liberty increased its position in northern New Jersey and southern California with the purchase of three industrial buildings totaling 354,391 square feet for $42.2 million. The buildings are 100% leased.

Real Estate Dispositions

During the third quarter Liberty disposed of two industrial buildings totaling 104,994 square feet for $5.8 million via a condemnation conveyance, and one 28,495 square foot office property for $2.8 million.

Balance Sheet and Capital Activity

During the quarter, Liberty’s board of trustees renewed the company’s share repurchase authority to purchase up to $250 million of its outstanding common shares, valid through September 28, 2019.

Subsequent to quarter end, Liberty amended and restated its existing $800 million unsecured revolving credit facility which was set to mature in March 2018 with a new, $900 million unsecured facility.  The new facility includes a revolving credit facility for aggregate borrowings of up to $800 million and a delayed draw term loan facility for aggregate borrowings of up to $100 million, and may be increased up to $1.6 billion in the aggregate in accordance with the terms of the credit agreement.  The new facility matures in October 2021 and Liberty has rights to extend the maturity date for up to one additional

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year. Subject to adjustment based upon Liberty’s corporate credit ratings, borrowings under the new facility currently bear interest at LIBOR plus 0.875% for revolving credit loans and LIBOR plus 0.95% for the delayed draw term loans.  The credit facility also contains customary covenants consistent with this type of facility.

In addition, subsequent to quarter end, Liberty also entered into a new $30 million unsecured working capital revolving credit facility on terms substantially consistent with the new unsecured revolving credit facility discussed above.

2017 Outlook

A reconciliation of projected U.S. GAAP net income available to common shareholders per share to projected NAREIT FFO per share for 2017 is below (all amounts projected). Additional information on assumptions underlying this guidance is included in Liberty’s third quarter supplemental financial report on the company’s website.

About the Company

Liberty Property Trust (NYSE:LPT) is a leader in commercial real estate, serving customers in the United States and United Kingdom, through the development, acquisition, ownership and management of superior office and industrial properties. Liberty’s 100 million square foot portfolio includes 566 properties which provide office, distribution and light manufacturing facilities to 1,200 tenants.

Additional information about the company, including Liberty’s Quarterly Supplemental Package with detailed financial information is available in the Investors section of the company’s web site at www.libertyproperty.com. If you are unable to access the web site, a copy of the supplemental package may be obtained by contacting Liberty by phone at 610-648-1704, or by e-mail to jleonard@libertyproperty.com.

Liberty will host a conference call during which management will discuss third quarter results, on Tuesday, October 24, 2017, at 1 p.m. Eastern Time.  To access the conference call, please dial 855-277-7530. The passcode needed for access is 80597739. A replay of the call will be available until November

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24, 2017, by dialing 1-855-859-2056 using the same passcode as above. The call can also be accessed via the Internet on the Investors page of Liberty’s web site at www.libertyproperty.com.

Forward-Looking Statements

The statements contained in this press release may include forward-looking statements within the meaning of the federal securities law.  These forward-looking statements include statements relating to, among others things, achievement of strategic targets, expectations for our operating results, business and financial condition, business and our growth prospects, as well as statements that are generally accompanied by words such as “believes,” “anticipates,” “expects,” “estimates,” “should,” “seeks,” “intends,” “proposed,” “planned,” “outlook,” “remain confident,” and “goal” or similar expressions. Although Liberty believes that the expectations reflected in such forward-looking statements are based on reasonable assumptions, it can give no assurance that its expectations will be achieved.  As forward-looking statements, these statements involve risks, uncertainties and other factors that could cause actual results to differ materially from the expected results.  These risks, uncertainties and other factors include, without limitation, uncertainties affecting real estate business generally (such as entry into new leases, renewals of leases and dependence on tenants’ business operations), risks relating to our ability to maintain and increase property occupancy and rental rates, risks relating to the continued repositioning of the Company’s portfolio, risks relating to construction and development activities, risks relating to acquisition and disposition activities, risks relating to the integration of the operations of entities that we have acquired or may acquire, risks relating to joint venture relationships and any possible need to perform under certain guarantees that we have issued or may issue in connection with such relationships, risks related to properties developed by the Company on a fee basis, risks associated with tax abatement, tax credit programs, or other government incentives, possible environmental liabilities, risks relating to leverage and debt service (including availability of financing terms acceptable to the Company and sensitivity of the Company’s operations and financing arrangements to fluctuations in interest rates), dependence on the primary markets in which the Company’s properties are located, the existence of complex regulations relating to status as a REIT and the adverse consequences of the failure to qualify as a REIT, risks relating to litigation and the potential adverse impact of market interest rates on the market price for the Company’s securities, and other risks and uncertainties detailed in the company’s filings with the Securities and Exchange Commission.  The company assumes no obligation to update or supplement forward-looking statements that become untrue because of subsequent events.

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Liberty Property Trust

Balance Sheet

September 30, 2017

(Unaudited and in thousands)

Liberty Property Trust

Statement of Operations

September 30, 2017

(Unaudited and in thousands, except per share amounts)

Liberty Property Trust

Statement of Funds from Operations

September 30, 2017

(Unaudited and in thousands, except per share amounts)

NAREIT Funds from Operations available to common shareholders is defined by NAREIT as net income (computed in accordance with U.S. GAAP), excluding gains (or losses) from sales of depreciable property and impairments of depreciable real estate assets, plus depreciation and amortization, and after adjustments for unconsolidated partnerships and joint ventures.  The SEC has agreed to the disclosure of this non-GAAP financial measure on a per share basis in its Release No. 34-47226, Conditions for Use of Non-GAAP Financial Measures. The Company believes that the calculation of NAREIT FFO is helpful to investors and management as it is a measure of the Company’s operating performance that excludes depreciation and amortization and gains and losses from operating property dispositions. As a result, year over year comparison of NAREIT FFO reflects the impact on operations from trends in occupancy rates, rental rates, operating costs, development activities, general and administrative expenses, and interest costs, providing perspective not immediately apparent from net income. In addition, management believes that NAREIT FFO provides useful information to the investment community about the Company’s financial performance when compared to other REITs since NAREIT FFO is generally recognized as the standard for reporting the operating performance of a REIT. NAREIT FFO available to common shareholders does not represent net income or cash flows from operations as defined by U.S. GAAP and does not necessarily indicate that cash flows will be sufficient to fund cash needs. It should not be considered as an alternative to net income as an indicator of the Company’s operating performance or to cash flows as a measure of liquidity. NAREIT FFO available to common shareholders also does not represent cash flows generated from operating, investing or financing activities as defined by U.S. GAAP. The Company believes that the line on its consolidated statements of comprehensive income entitled “net income available to common shareholders” is the most directly comparable U.S. GAAP measure to FFO.