Recently acquired software firm AppDynamics roughly doubled its San Francisco office space earlier this year. The firm added 67,000 square feet to its space at 303 2nd St. with landlord Kilroy Realty Corp., bringing its total footprint to just under 150,000 square feet, according to Kilroy’s most recent earnings statement. Kilroy credited the expansion with fueling the firm’s strong leasing in San Francisco and other West Coast cities during the first quarter. “Our real estate markets are…