Exhibit 99.1

News Release

PS Business Parks, Inc.

701 Western Avenue

Glendale, CA 91201-2349    

psbusinessparks.com

PS Business Parks, Inc. Reports Results for the Quarter Ended September 30, 2020 and Acquires a 246,000 Square Foot Multi-Tenant Industrial Park Located in Alexandria, Virginia, for $46.3 Million

GLENDALE, California—PS Business Parks, Inc. (NYSE:PSB) reported operating results for the three and nine months ended September 30, 2020 and announced that it acquired a 246,000 square foot multi-tenant industrial park located in Alexandria, Virginia, for $46.3 million.

Operating Results for the Three and Nine Months Ended September 30, 2020

Net income allocable to common shareholders for the three and nine months ended September 30, 2020 was $30.6 million, or $1.11 per diluted common share, and $97.7 million, or $3.55 per diluted common share, respectively. Net operating income (“NOI”) attributable to the Company’s Same Park portfolio (defined below) was $67.5 million and $202.8 million for the three and nine months ended September 30, 2020, respectively, representing a decrease of 0.3% and an increase of 0.2% over the same periods in 2019, respectively. Net income and NOI for both the three and nine month periods ended September 30, 2020 were negatively affected by the COVID-19 pandemic and its impact on certain of the Company’s customers.

The Company also reports NOI on a cash basis, which excludes non-cash rental income such as amortization of deferred rent receivable and other non-cash items, and also excludes rents that have been deferred or abated during the period. Same Park Cash NOI was $66.2 million and $198.1 million for the three and nine months ended September 30, 2020, respectively, each representing a decrease of 1.1% over the same periods in 2019. The decrease in Same Park Cash NOI for the three months ended September 30, 2020 was a result of 0.8% cash rental income growth offset by 5.3% growth in adjusted cost of operations, while the decrease for the nine months ended September 30, 2020 was the result of a 0.2% decline in cash rental income and 2.1% growth in adjusted cost of operations.

The following table details the change in Same Park rental income for the three and nine months ended September 30, 2020 and 2019 (in thousands):

Additional detail on Same Park NOI and Same Park Cash NOI for the three and nine months ended September 30, 2020 is provided in the Property Operations–Same Park Portfolio section below.

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Funds from Operations (“FFO”), Core FFO, and Funds Available for Distribution (“FAD”)

FFO for the three and nine months ended September 30, 2020 was $1.55 per share and $4.85 per share, respectively, representing decreases of 9.2% and 5.5% from the same periods in 2019. FFO is a non-GAAP measure defined by the National Association of Real Estate Investment Trusts and generally represents GAAP net income before (i) real estate depreciation and amortization expense, (ii) gains or losses on sales of operating properties, and (iii) land and impairment charges on real estate assets.

Core FFO, which the Company defines as FFO excluding the impact of (i) charges related to the redemption of preferred stock and (ii) other nonrecurring income or expense items as appropriate, was $1.61 and $4.91 per share for the three and nine months ended September 30, 2020, respectively. During the three and nine months ended September 30, 2020, the Company accelerated the amortization of $1.7 million of stock compensation expense as a result of the retirement of its President and Chief Executive Officer, Maria Hawthorne. Separately, the Company also incurred non-capitalizable demolition costs of $0.3 million related to its multifamily development in Tysons, Virginia. The accelerated amortization of stock compensation expense and the non-capitalizable demolition costs are included in FFO but excluded for Core FFO purposes due to the nonrecurring nature of these expenses. Additional information is included on the Company’s quarterly report on Form 10-Q.

FAD for the three and nine months ended September 30, 2020 was $48.3 million and $142.1 million, respectively, representing a decrease of 6.0% and 5.2% from the same periods in 2019. The decreases in FAD were largely attributable to rent deferrals (net of amounts repaid) and abatements of $0.8 million and $5.4 million, for the three and nine months ended September 30, 2020, respectively, as the Company does not include rents deferred or abated in its computation of FAD. FAD is a non-GAAP measure that represents Core FFO adjusted to (i) deduct recurring capital improvements and capitalized tenant improvements and lease commissions and (ii) remove certain non-cash income or expenses, such as amortization of deferred rent receivable and stock compensation expense.

FFO, Core FFO, and FAD are not substitutes for GAAP net income. Other real estate investment trusts (“REITs”) may compute FFO, Core FFO, and FAD differently, which could inhibit comparability. The Company believes its presentations of FFO, Core FFO, and FAD assist investors and analysts in analyzing and comparing the operating and financial performance between reporting periods.

Acquisition Activity

Subsequent to September 30, 2020, the Company completed the acquisition of Pickett Industrial Park, a 246,000 square foot infill multi-tenant industrial park located in Alexandria, Virginia, for a total purchase price of $46.3 million. The park consists of three buildings with suites ranging from 7,000 to 75,000 square feet and was 100% occupied at closing.

The park is strategically located inside the Capital Beltway in the rapidly redeveloping Van Dorn Corridor, has immediate access to I-95, I-495, and I-395 freeways and is in close proximity to the Pentagon, Fort Belvoir, and the U.S. Capital. This acquisition is complementary to the Company’s existing Northern Virginia industrial and flex portfolio totaling 3.0 million square feet.

Leasing Production

During the three and nine months ended September 30, 2020, the Company executed leases on 2.0 million and 5.6 million square feet, respectively, compared to 2.0 million and 5.3 million for the three and nine months ended September 30, 2019, respectively. The Company also reported that it entered into a 10-year lease on the 288,000 square foot single-tenant industrial building at its Hathaway Business Park located in its Los Angeles sub-market, which is included in the lease production stats for the three and nine month periods ended September 30, 2020. The lease commenced in October 2020 with cash rental rate growth of 36.1% over the prior lease which expired April 30, 2020. Weighted average cash rental rate growth on leases executed during the three and nine months ended September 30, 2020, was 5.2% and 5.9%, respectively, while average net effective rent¹ growth was 18.7% and 16.4% for the same periods, respectively. Average lease term of the leases executed during the three months ended September 30, 2020 was 4.3 years, with associated average transaction costs (tenant improvements and leasing commissions) of $3.46 per square foot. For comparative purposes, average lease term and transaction costs on leases executed in the same period of 2019 were 3.9 years and $3.80 per square foot, respectively.

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Property Operations–Same Park Portfolio

The Company believes that evaluation of the Same Park portfolio, defined as all properties owned and operated as of September 30, 2020 that were acquired prior to January 1, 2018, provides an informative view of how the Company’s portfolio has performed over comparable periods. As of September 30, 2020, the Same Park portfolio consisted of 25.7 million rentable square feet, or 93.5% of the 27.5 million rentable square feet in the Company’s total portfolio, and excluded the Company’s 95.0% interest in a 395-unit multifamily property.

The following table presents the unaudited operating results of the Company’s Same Park facilities for the three and nine months ended September 30, 2020 and 2019 (in thousands, except per square foot amounts):

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The following table summarizes unaudited selected quarterly financial data with respect to the Same Park facilities (in thousands, except per square foot amounts):

4

COVID-19 Pandemic/Rent Collections Update

The COVID-19 pandemic has had and is expected to continue to have a significant impact on our operations and capital plans. During the three months ended September 30, 2020, the Company granted $1.7 million of deferred rent and $0.3 million of rent abatement. Through the nine months ended September 30, 2020, the Company had granted rent relief to 388 customers (approximately 11.0% of total customers based on rental income) including $5.5 million of rent deferral and $1.2 million of rent abatement. As of October 26, 2020, the Company collected $1.3 million, or 98.3%, of the scheduled repayments of COVID-19 related rent deferrals billed through September 30, 2020.

During the three months ended September 30, 2020, the Company wrote-off $0.3 million of accounts receivable, which is in-line with the $0.3 million written-off during the three months ended September 30, 2019. Also during the three months ended September 30, 2020, the Company wrote-off deferred rent receivables of $0.3 million, which is roughly in-line with the $0.1 million written-off during the three months ended September 30, 2019. During the nine months ended September 30, 2020, the Company wrote-off accounts receivable and deferred rent receivable of $1.5 million and $2.7 million, respectively, compared to $0.9 million and $0.4 million, respectively, during the same period in 2019.

The table below represents percentages of billed revenue that the Company has collected, deferred, and abated/written-off, by product type, for the respective periods presented (percentages shown are all as of October 26, 2020):

As of October 26, 2020, the Company had open rent relief requests from approximately 1% of customers. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations–Overview, Impact of COVID-19 Pandemic” in our September 30, 2020 Form 10-Q for more information.

Brentford at The Mile Development, Tysons, Virginia

In August 2020, the Company entered into a joint venture agreement with a real estate development company (“JV Partner”) for the purpose of developing Brentford at The Mile, a planned 411-unit multifamily apartment complex within its 628,000 square foot office and multifamily park located in Tysons, Virginia (“Brentford Joint Venture”). Under the Brentford Joint Venture agreement, the Company has a 98.2% controlling interest and is the managing member with the JV Partner holding the remaining 1.8% limited partnership interest.

Construction of Brentford at The Mile commenced in August 2020 and is anticipated to be completed over a period of 24 to 36 months at an estimated development cost of $110 million to $115 million, excluding the cost of land. During the three months ended September 30, 2020, the Company incurred non-capitalizable demolition costs of $0.3 million in interest and other expense on its consolidated statements of income.

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Disposition Activity

On September 16, 2020, the Company sold two industrial buildings totaling 40,000 square feet located in Redmond, Washington, that were subject to an eminent domain process for a gross sales price of $11.4 million, which resulted in a gain of $7.7 million.

Distributions Declared

On October 21, 2020, the Board of Directors declared a quarterly dividend of $1.05 per common share. Distributions were also declared on the various series of depositary shares, each representing 1/1,000 of a share of preferred stock. Distributions for both common shares and preferred stock will be payable on December 30, 2020 to shareholders of record on December 15, 2020.

Company Information

PS Business Parks, Inc., a member of the S&P MidCap 400, is a REIT that acquires, develops, owns, and operates commercial properties, primarily multi-tenant industrial, flex, and office space. As of September 30, 2020, the Company wholly owned 27.5 million rentable square feet with approximately 5,000 commercial customers in six states. The Company also held a 95.0% interest in a 395-unit apartment complex and a 98.2% interest in a development of a 411-unit multifamily apartment complex.

Forward-Looking Statements

When used within this press release, the words “may,” “believes,” “anticipates,” “plans,” “expects,” “seeks,” “estimates,” “intends,” and similar expressions are intended to identify “forward-looking statements.” Such forward-looking statements involve known and unknown risks, uncertainties, and other factors, which may cause the actual results and performance of the Company to be materially different from those expressed or implied in the forward-looking statements. Such factors include the duration and severity of the COVID-19 pandemic and its impact on our business and our customers; the impact of competition from new and existing commercial facilities which could impact rents and occupancy levels at the Company’s facilities; the Company’s ability to evaluate, finance, and integrate acquired and developed properties into the Company’s existing operations; the Company’s ability to effectively compete in the markets that it does business in; the impact of the regulatory environment as well as national, state, and local laws and regulations including, without limitation, those governing REITs; the impact of general economic and business conditions, including as a result of the economic fallout of the COVID-19 pandemic; rental rates and occupancy levels at the Company’s facilities; and changes in these conditions as a result of the COVID-19 pandemic, the availability of permanent capital at attractive rates, the outlook and actions of rating agencies and risks detailed from time to time in the Company’s SEC reports, including quarterly reports on Form 10-Q, reports on Form 8-K, and annual reports on Form 10-K.

Additional information about PS Business Parks, Inc., including more financial analysis of the third quarter operating results, is available on the Company’s website at psbusinessparks.com.

A conference call is scheduled for Thursday, October 29, 2020, at 10:00 a.m. PDT (1:00 p.m. EDT) to discuss third quarter results. The Company will also be discussing its response to the COVID-19 pandemic and the effects it has had on its customers and the operation of its properties. The toll free number is (866) 342-8591; the conference ID is PSBQ320. The call will also be available via a live webcast on the Company’s website. A replay of the conference call will be available through November 12, 2020 at (800) 839-5631, as well as via webcast on the Company’s website.

Additional financial data attached.

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PS BUSINESS PARKS, INC.

CONSOLIDATED BALANCE SHEETS

(In thousands, except share data)

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PS BUSINESS PARKS, INC.

CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except per share amounts)

(Unaudited)

8

PS BUSINESS PARKS, INC.

Computation of Funds from Operations (“FFO”), Core FFO, and Funds Available for Distribution (“FAD”)

(In thousands, except per share amounts)

(Unaudited)

9

PS BUSINESS PARKS, INC.

Reconciliation of Selected Non-GAAP Measures to Analogous GAAP Measures

(Unaudited, in thousands)

10