PS Business Parks : GLENDALE, California — PS Business Parks, Inc. Reports Results for the Quarter Ended June 30, 2017

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 June 30, 2017

GLENDALE, California-PS Business Parks, Inc. (NYSE:PSB) reported operating results for the quarter ended June 30, 2017.

Net income allocable to common shareholders was $24.7 million, or $0.90 per share, for the three months ended June 30, 2017, an increase of $9.0 million, or 57.3%, from $15.7 million, or $0.58 per share, for the three months ended June 30, 2016. Net income allocable to common shareholders was $51.1 million, or $1.87 per share, for the six months ended June 30, 2017, an increase of $20.8 million, or 68.8%, from $30.3 million, or $1.12 per share, for the six months ended June 30, 2016. The increases were due to an increase in net operating income ("NOI"), the gain on sale of real estate in Dallas, Texas, the gain on sale of development rights in Silver Spring, Maryland, and reduced interest expense resulting from the repayment of a $250.0 million mortgage note.

Funds from operations ("FFO") were $54.1 million, or $1.55 per share, for the three months ended June 30, 2017, an increase of

$8.8 million, or $0.25 per share, from the three months ended June 30, 2016 of $45.3 million, or $1.30 per share. FFO was

$107.1 million, or $3.07 per share, for the six months ended June 30, 2017, an increase of $18.1 million, or $0.51 per share, from the six months ended June 30, 2016 of $89.0 million, or $2.56 per share. The increases were due to an increase in NOI, reduced interest expense, savings from lower preferred distributions and a one-time net non-cash stock compensation charge of $2.0 million during the second quarter of 2016 related to a change in senior management.

In order to provide meaningful period-to-period comparisons of FFO derived from the Company's ongoing business operations, the Company excluded the net non-cash stock compensation charge of $2.0 million, as noted above, for the three and six months ended June 30, 2016 to compute FFO, as adjusted.

FFO, as adjusted, was $54.1 million, or $1.55 per share, for the three months ended June 30, 2017, an increase of $6.8 million, or $0.19 per share, from the three months ended June 30, 2016 of $47.3 million, or $1.36 per share. FFO, as adjusted, was $107.1 million, or $3.07 per share, for the six months ended June 30, 2017, an increase of $16.1 million, or $0.45 per share, from the six months ended June 30, 2016 of $91.0 million, or $2.62 per share. These changes were due to an increase in NOI, reduced interest expense and savings from lower preferred distributions.

The following table reconciles FFO per share, as reported, to FFO per share, as adjusted, for the three and six months ended June 30, 2017 and 2016:

Same Park NOI increased $3.5 million, or 5.2%, for the three months ended June 30, 2017 and $9.2 million, or 7.0%, for the six months ended June 30, 2017 compared to the same periods in 2016. The increase in Same Park NOI was driven by improving rental rates and occupancy as adjusted rental income (as defined below) increased $4.3 million, or 4.5%, from $95.2 million for the three months ended June 30, 2016 to $99.4 million for the three months ended June 30, 2017. Adjusted rental income increased $9.0 million, or 4.8%, from $190.1 million for the six months ended June 30, 2016 to $199.1 million for the six months ended June 30, 2017.

All per share amounts noted above are presented on a diluted basis.

To evaluate the performance of the Company's portfolio over comparable periods, management analyzes the operating performance of properties owned and operated throughout both periods (herein referred to as "Same Park"). The Same Park portfolio includes all operating properties acquired prior to January 1, 2015. Operating properties acquired subsequently are referred to as "Non-Same Park." For the three and six months ended June 30, 2017 and 2016, the Same Park facilities constitute

27.8 million rentable square feet, representing 99.3% of the 28.0 million square feet in the Company's total portfolio as of June 30, 2017.

The following table presents the operating results of the Company's properties for the three and six months ended June 30, 2017 and 2016 in addition to other income and expense items affecting net income (unaudited, in thousands, except per square foot amounts):

(1) Adjusted rental income excludes rental income from assets sold or held for development of $43,000 and $159,000 for the three and six months ended June 30, 2017, respectively, and $935,000 and $1.9 million for the three and six months ended June 30, 2016, respectively.

(2) Adjusted cost of operations excludes LTEIP amortization of $407,000 and $1.2 million for the three and six months ended June 30, 2017, respectively, and $791,000 and $1.7 million for the three and six months ended June 30, 2016, respectively. Adjusted cost of operations also excludes cost of operations from assets sold or held for development of $29,000 and $73,000 for the three and six months ended June 30, 2017, respectively, and $236,000 and $489,000 for the three and six months ended June 30, 2016, respectively.

(3) NOI, a non-GAAP measure, is often used by investors to determine the performance and value of commercial real estate. Management believes that Same Park NOI, also a non-GAAP measure, provides investors a useful measure for comparing the performance of the Company's commercial real estate portfolio across reporting periods. The Company's calculation of NOI and Same Park NOI may not be comparable to those of other companies and should not be used as an alternative to measures of performance in accordance with generally accepted accounting principles.

(4) Adjusted general and administrative expenses exclude LTEIP amortization of $711,000 and $1.7 million for the three and six months ended June 30, 2017, respectively, and $3.3 million and $4.9 million for the three and six months ended June 30, 2016, respectively.

(5) Computed by dividing Same Park NOI by Same Park adjusted rental income.

(6) Represents the annualized Same Park adjusted rental income earned per occupied square foot.

Highgate at the Mile, the Company's multi-family development in Tysons, Virginia, commenced its principle operations during the second quarter of 2017. The 435,000 square foot project will include 395 residential units and approximately 2,100 square feet of retail space. As of June 30, 2017, 233 of the 395 units have been completed with the balance of units expected to be completed by the end of the fourth quarter of 2017. As of June 30, 2017, 39 units, or 9.9%, have been leased. During the three and six months ended June 30, 2017, the Company recorded an equity loss in the unconsolidated joint venture of $382,000, comprised of a net operating loss of $278,000 and depreciation expense of $104,000. As of July 24, 2017, Highgate's multi- family residential units were 19.0% leased and 14.2% occupied.

On May 1, 2017, the Company disposed of Empire Commerce, a two-building single-story office park comprising 44,000 square feet, located in Dallas, Texas, for net proceeds of $2.1 million, which resulted in a net gain of $1.2 million.

The following are key financial ratios with respect to the Company's leverage as of and for the three months ended June 30, 2017:

(1) Fixed charges include interest expense and capitalized interest totaling $504,000.

On July 25, 2017, the Board of Directors declared a quarterly dividend of $0.85 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 listed below. Distributions are payable on September 28, 2017 to shareholders of record on September 13, 2017.

PS Business Parks, Inc., a member of the S&P SmallCap 600, is a self-advised and self-managed real estate investment trust ("REIT") that acquires, develops, owns and operates commercial properties, primarily multi-tenant flex, office and industrial space. The Company defines "flex" space as buildings that are configured with a combination of office and warehouse space and can be designed to fit a number of uses (including office, assembly, showroom, laboratory, light manufacturing and warehouse space). As of June 30, 2017, the Company wholly owned 28.0 million rentable square feet with approximately 4,900 customers in six states.

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 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 conditions upon rental rates and occupancy levels at the Company's facilities; 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 second quarter operating results, is available on the Company's website at psbusinessparks.com.

A conference call is scheduled for Wednesday, July 26, 2017, at 8:00 a.m. PDT (11:00 a.m. EDT) to discuss the second quarter results. The toll free number is (888) 299-3246; the conference ID is 45198402. 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 August 2, 2017 at (855) 859-2056. A replay of the conference call will also be available on the Company's website.

Additional financial data attached.