Douglas T. Linde
President and Director at Boston Properties
Thanks, Owen. Good morning, everybody. I hope what you're going to hear today from me is you're going to be with a pretty constructive perspective on what's going on in our markets and what's going on with our revenue picture and our leasing picture. As we sit here at the end of the first quarter, in spite of the absence of a broad pickup in office-using jobs, BXP continues to lease space. We are leasing space. There's momentum in the economy despite persistent high interest rates. Overall earnings growth for our clients and potential clients appears to be improving, and we're pretty optimistic it's going to lead to employment and space additions.
And while we are not going to see broad reports of shrinking availability across any market, until there is a pickup in white collar job formation, there are pockets of supply constrained in select submarkets where we are seeing competition for space and improving economics. As reported in our supplemental, the mark-to-market of the leases that commenced this quarter was up 7% and the transaction costs averaged $8.60 per year, which is lower than it's been in the last few quarters. The overall mark-to-market of the starting cash rents on leases executed this quarter relative to the previous in-place cash rent was up about 2%.
The starting cash rents on leases we signed this quarter on second-generation space, we're up about 22% in Boston, down 6.5% in Manhattan, down 3% in D.C. and up 8% on the West Coast with San Francisco CBD up 12%. Boston's increased is in large part due to a replacement of a tenant that was in default and had stopped paying. Adjusting for the transaction, the Boston numbers would have been up about 6%. As Owen stated, the seasonal trend line of BXP's leasing activity in the first quarter of '24 picked up relative to what we experienced in the first quarter of '23. This quarter, we completed 61 transactions, 32 new leases for 494,000 square feet and 29 renewals encompassing 399,000 square feet. We had three expansions totaling 18,000 square feet and four contractions totaling 44,000 square feet.
As a point of comparison, in the first quarter of '23, there were 57 leases, 29 leases were with new clients for 410,000 and 28 renewals for 250,000. There were 10 expansions and three contractions. Last quarter, Fourth quarter of '23, we signed 37 lease renewals and 37 leases with new clients, and there were eight contractions and nine expansions among our existing clients. This quarter, new leases encompass 55% of the volume. Activity was across the entire portfolio with 178,000 square feet in Boston, 225,000 square feet in the New York region, 154,000 square feet from the West Coast and D.C. lead attack with 336,000 square feet.
And to give you some additional color on this activity, there was only one transaction greater than 60,000 square feet due to the 215,000 square feet long-term law firm extension that included a 25,000 square foot contraction in D.C. although that same law firm took an additional 7,600 square feet in our Reston portfolio. Princeton made up 38% of the New York activity this quarter, almost all new clients. New clients made up 90% of the leasing volume in Boston and in New York, while renewals captured 73% of the West Coast and D.C. market. Equally important is our pipeline. Post March 31, we have over 875,000 square feet of active leases under negotiation, which we define as a transaction that is being documented by our legal teams and some of these transactions have been completed.
This is consistent with the level of in-process leases we've made for the last few quarters. These transactions include a multifloor expansion of an asset manager in our Midtown portfolio in New York, a full floor expansion by a law firm in Midtown, an asset manager taking a full floor 360 Park Avenue South, consumer brand company relocating to a building in Waltham, a multi-floor renewal of a law firm in San Francisco with no change in the premises and a downsizing along with an extension of a technology company in Reston, Virginia and a similar transaction in Waltham.
We have seen an uptick in the number of active deals. At the end of the quarter, we had signed leases that had yet to commence on the in-service vacancy, totaling approximately 817,000 square feet, which includes 624,000 square feet that is anticipated to commence in 2024. We also have signed leases with new clients for another 534,000 square feet of currently occupied states. These leases have yet to commence but they are reflected in the reduction of our rollover exposure shown in our supplemental. The strongest user demand continues to come from the asset managers, including private equity venture hedge funds, specialized fund managers and their financial and legal advisers.
These organizations are the heart and soul of our New York and our Back Bay activity and are an important driver of our San Francisco CBD demand. In some instances, these clients are growing their teams and capital under management. But in all cases, they want to occupy premier workplaces. We continue to see significantly more client demand in our East Coast portfolio versus the West Coast due to the disproportionate concentration of technology and media content related demand on the West Coast. However, there have been some subtle and encouraging trends across much of the portfolio. Our Back Bay Boston and Park Avenue Centric New York City portfolio continue to have outsized demand relative to our availability. While concessions are still at elevated levels, we've been able to increase our taking rents and we actually have clients that we cannot accommodate due to a lack of available space in certain buildings.
In the last 90 days, there is the strong pickup of client activity in our Urban Edge Waltham portfolio. We have an 80,000 square foot tech client expiring in 2024 with a planted downsize to 16,000 square feet. This quarter, we completed a lease for 45,000 square feet and are in negotiations with two other clients, new ones for another 37,000 square feet of that expiration, and the existing client will stay with us but relocate within the building. Additionally, in a different Urban Edge building, we're negotiating a 45,000 square foot lease with an existing subtenant to extend when their prime lease expires in '25. We're negotiating a 25,000 square foot lease with a lab user proportion of our availability on Second Avenue and we're negotiating a 55,000 square foot lease with a nontech company in a different building.
None of these transactions more than 220,000 square feet were in our pipeline on 12/31/2023. All of this occurred in the last 90 to 120 days. In the District of Columbia and Northern Virginia, we continue to see more buildings with over leveraged capital structures unwilling to provide capital for new transactions, and therefore, they have very little client interest. At the other end of the spectrum, when the market got wind of our lease extension at 901 New York Avenue and the anticipated enhancements that we are planning, the interest in the available space at New York -- 901 New York accelerated dramatically. Reston continues to house the largest concentration of our Washington regional portfolio. It's the headquarters for VW, Batel, Leidos, SAIC, Peraton, Kaki, Metron, Comscore, Mandiant and the College Board and it's also the home to a number of large technology companies like Microsoft.
Because of the environment of the Town Center with seven days a week food, beverage and shopping and is also a natural location for small businesses in the financial services and legal industries. This quarter, we completed a 58,000 square foot lease with a new technology client at Reston Next that's moving from a toll road building, an expansion for law firm, and we are seeing a pickup in small tenant activity relate to '23 and as well as large users looking to upgrade their premises. The AI organizations in the city of San Francisco continue to look for additional space, which will continue the positive absorption story. They continue to focus, however, on build and expensive space. And while there is an abundance of available space in the city, there continues to be outsized demand for view-spaced north of market relative to the available supply.
We completed a 35,000 square foot lease with a boutique financial adviser at Embarcadero Center this quarter that was only interested in view spaced north of market. We're negotiating six transactions with new clients totaling 40,000 square feet as well as an 80,000 square foot renewal with a law firm that's retaining their existing point. Today, the Seattle CBD is almost exclusively a lease expiration-driven market, and there has been a material pickup in the level of activity. The number of tenant tours that we have conducted has picked up in the last two quarters. We completed a lease with a new client on a 10,000 square-foot prebuilt suite and are in negotiations with a law firm for a parcel floor and discussions with a technology company for a full floor.
West L.A, however, continues to be the market where activity remains light. While Century City is seeing great demand and strong rents as financial and professional services firms head west from the downtown market, those clients are not yet prepared to take space in low-rise buildings in Santa Monica. There continues to be pressure from streaming profitability, industry consolidation and job reduction in the gaming and media space that is impacting overall demand growth in the West L.A. area. As we forecast during our last call, our occupancies declined also slightly from 88.4% to 88.2% during the quarter, with a known expiration of 230,000 square feet in Princeton, where, as I mentioned, we have signed 80,000 square feet of new client deals this quarter that will commence this year.
We have two additional large lease expirations across the portfolio in '24 that will occur during the second quarter, 200,000 square feet at 680 Folsom in San Francisco and 230,000 square feet at Seven Times Square, where we own 55%. Occupancy will drop in the second quarter and recover as we move into the fourth quarter. Mike is going to spend some time discussing changes to our interest expense outlook in his remarks. The issue of the day is the level of inflation, and I thought I'd make a few brief comments on how inflation is impacting our business. We are not seeing any deflation in our base building costs as we build -- as we bid potential stick-frame residential the projects Owen was describing earlier, but escalation assumptions are now normalized. No more 8% to 9%.
The changes to the building in energy codes, along with the elevated level of interest expense associated with any construction financing, continue to pressure project costs and make new starts very challenging. However, we are seeing costs come down on tenant improvement jobs, which is a reflection of reduced demand on the group of contractors and subcontractors that focus on interiors work who are looking to maintain a consistent book of business. New high-rise tower construction costs are unlikely to deflate in the longer-term interest rate environment and the long-term interest rates remain at the elevated levels, the longer it's going to be before we see market rents approach the levels necessary to rationalize new office building, leasing economics and corresponding new development.
We are experiencing an operating environment where leasing available space is primarily driven by gaining market share. That's with the world that we are living in, and we're winning. As clients choose premier properties in sound financial condition, operated by the best property management teams, BXP will continue to be successful in doing just that.
I'll stop there and turn it over to Mike.