Good morning, everyone. With Steve having covered the basic statistics of our leasing business this morning, I'm going to be relatively brief and give you some color on current market conditions and our own activity in the first quarter. During our year-end call, I spoke at length about the key driver of demand for space, office-using employment. I was then, and remain today, very optimistic about the prospects for the New York economy based on both underlying fundamentals and potential federal policy changes.
I did sound one note of caution, however, noting that in 2016, office-using employment grew by about 5,000 jobs, positive, but well below the blistering pace of the 35,000 office sector jobs this city added on an annual basis since 2010. It turns out that recently revised numbers from the Bureau of Labor Statistics now paint a picture of much more robust job creation last year in New York. The revised BLS numbers now show that office-using employment actually grew by 33,000 jobs in 2016, led by the professional and business services sector, which alone added 27,000 positions. Office-using employment reached a record high of 1.4 million jobs in 2016 or about 1/3 of all jobs in the city. And in January of this year, citywide unemployment dropped to 4.5%, the lowest rate since 1970 when the state Department of Labor started measuring it.
Preliminary BLS numbers for the first quarter of 2017 again show a moderation of this trend, with office-using employment being relatively flat in the first quarter. We will continue to follow these job numbers closely, as we always do, recognizing that the city will need to add only 10,000 to 15,000 office sector jobs annually, less than 50% of the pace of the last 7 years, to absorb the new supply coming online over the next 5 years. Meanwhile, the city and state continue to announce new initiatives aimed at growing employment, including a significant focus on life sciences with Columbia, Cornell and NYU all completing major new expansions. In short, both the near and long-term outlooks remain very positive.
The leasing market bears out this view. In the first quarter, in Manhattan, 7.6 million square feet of new leases were signed, up 16% year-over-year. And 3.4 million square feet of renewals were completed, with total leasing activity reaching 11 million square feet, in fact, the best first quarter in 17 years. Net absorption was a positive 876,000 square feet. As CBRE noted, the market remains highly segmented, with demand increasingly focused on product rather than location. Tenants want new construction. Tenants want renovated, higher-quality buildings. And all that bodes well for our fleet, which is in great shape after our recent redevelopment efforts as well as the newbuilds we are bringing into the market, including our untapped potential of our Penn Plaza holdings.
Let me now turn to our own office portfolio, where business has been and remains very good. Reflecting the city's continuing healthy job growth, I would note, and this is really significant, that of the 553,000 square feet re-leased in the first quarter, 44% of that activity was comprised of tenants new -- for the first time, new to New York City or expanding their footprint in the city. A few examples. In the financial services sector, the huge global commodities firm, Glencore, is relocating its headquarters from Stamford, Connecticut to our 330 Madison Avenue, where it will take 63,000 square feet. I'm certain that many of you on this call can remember years back when Connecticut was taking financial services jobs from New York, and that's a trend that was expected to accelerate. Well, now, that trend has reversed itself. Wells Fargo expanded its footprint at 280 Park Avenue, growing to over 40,000 square feet. And in the TAMI sector, we completed a 43,000-square-foot headquarters leased with HomeAdvisor, an IAC company, which you probably read about in the paper this morning since it's on an acquisition trail at 330 West 34th Street. We also brought automotiveMastermind to One Park Avenue with a 30,000-square-foot lease. And Google continued its growth at 85 Tenth Avenue, with the addition of nearly 60,000 square feet, bringing its total footprint in the building to 240,000 square feet.
High-end financial services activity in the first quarter was also active. We executed 6 leases at triple-digit rents, a total of 50,000 square feet, some 10% of our total leasing activity at average starting rents of $111 per square foot in 3 of our trophy buildings: 280 Park, 650 Madison and 888 Seventh Avenue. Our remaining 2017 lease expirations are now down to 239,000 square feet spread across the portfolio in small spaces, and our 2018 expirations total 1,180,000 square feet. Our leasing machine remains busy with 515,000 square feet of leases in active negotiation and an additional 600,000-plus square feet in the pipeline.
At 96.7% occupancy, our portfolio with over 1,300 tenants is full. The single largest block of space we currently have available is 84,000 square feet at One Penn Plaza, where we now have a lease out for 45,000 square feet of the space. As Steve said in his Chairman's letter, our sweet spot is capturing the 50,000 to 200,000-square-foot tenants, which reflects the bulk of our activity.
Our work to grow our office portfolio continues, especially in the red-hot West Chelsea submarket, where our 2 newbuilds are rising rapidly. At 61 Ninth, in the heart of the meatpacking district, next door to the Chelsea Market and across the street from Google's massive headquarters, we've poured concrete through the sixth floor. In the third quarter, we will turn over the ground floor and lower level to Starbucks for the buildout of their 20,000-square-foot Reserve Roastery & Tasting Room concept, and we're targeting substantial completion of the building by the end of the first quarter of 2018.
At 512 West 22nd Street, which is directly on the high line, we've completed structure through the ninth floor and begun work on the façade, with substantial completion expected by the end of this year. These buildings, as I have said before, are 2 of our trophy assets of the future, architecturally distinctive new product with unique features, including outdoor green space on every floor in the hottest location in the city. And the repositioned Farley Building, including the dramatic new Moynihan Train Hall, will join them in a few years. We, and our partners at Related and Skanska, anticipate closing on this transaction with the state this quarter, and look forward to creating a new gateway for New York, along with 750,000 square feet of the best-in-class office space being delivered in New York.
Regarding our best-in-class street retail business, I think Steve covered it all in his opening remarks and in his Chairman's letter. Let me now turn to theMART in Chicago, where we signed a significant office lease in the first quarter, as Allstate continued its expansion in the building, taking an additional 57,000 square feet, expanding its footprint to 102,000 square feet. This completes our previously announced reduction of the trade show space from 2 floors to one floor, downsizing the trade show footprint from 400,000 to 200,000 square feet, while maintaining substantially all of the trade show income. Think about it. Effectively, we were able to create 200,000 square feet of office space for free, all of which has now been taken by Allstate and PayPal.
Similar to secular trends we have seen in New York, last month, the Wall Street Journal reported that nearly 90% of the more than 330,000 jobs created in Illinois over the last 5 years were created in the Chicago metro area, many of which, in fact, have moved to theMART: Motorola Mobility, ConAgra Foods, Beam Suntory, Allstate, Yelp, PayPal, Bosch, Caterpillar and Pitchfork and Condé Nast, both part of the Advance Publications group of companies. The scale of theMART allows us to continue investing in best-in-class amenities. And in June, we will launch Marshall's Landing, a multipurpose space on the second floor, at the top of the 50-foot wide grand stair that ties together the first and second floors of theMART, this new 12,000-square-foot concept to include a full-service restaurant with seating for up to 250 guests, a bar, café, lounge and event spaces, all to serve both our office tenants and visitors.
Finally, let me turn briefly to 555 California Street in San Francisco, the premier building in that city with a blue-chip tenant roster, where we completed a 12-year lease renewal with UBS for 55,000 square feet and a relocation expansion with Centerview Partners. Our complete building-wide modernization of the adjacent historic 315 Montgomery building is expected to be completed by June. And later this year, we will commence the total redevelopment of the former Bank of America banking hall that we call The Cube into a great creative office space.
to conclude, we remain very constructive on the New York marketplace. Demand for office space is robust, and we remain full.
And with that, I'll turn the call over to Joe.