Here's the thing:

Nationwide, the biggest single source of emissions is transportation, dominated by low-occupancy cars and trucks. But in New York, most people use mass transit instead of driving. That means buildings “are by far the largest source” of climate pollution in the city, said Christopher Halfnight, senior director of research and policy at the Urban Green Council, a nonprofit focused on energy efficiency in buildings. Gas- and oil-burning furnaces and water heaters are together responsible for 40% of NYC emissions, according to Halfnight.

In response to this, New York City has been passing laws that restrict greenhouse gases and that by and large incentivize electrification. One of these is Local Law 97, which will generally require buildings over 25,000 sf to reduce their GHG emissions by 40% (relative to 2005) by 2030.

Already the market is responding. Alloy Development has just completed the city's first all-electric tower at 505 State Street in Brooklyn. Tenants began moving in on April 5.

When team members asked what the complex would look like absent gas, the answers were fairly straightforward. “Instead of a gas boiler, an electric boiler; instead of a gas cooktop, it was an induction cooktop. And literally that was it,” said Pires, noting that they had to revise the design of the electrical room to allow for higher amperage, since more incoming electricity would be needed for a larger electrical load.

Some, or perhaps many, in the industry are fighting these new laws. In 2022, a co-op in Queens apparently went to the New York Supreme Court. But directionally, this certainly looks to be where we are headed. So you can either fight it, or you can try and get ahead of it, as Alloy has done here.

For more information on 505 State Street, go here (Bloomberg) and here (project website).

At the end of 2020, I wrote about a cross-laminated timber apartment building that Joanne and Fred Wilson were building in Brooklyn at 383 Greene Street.

Well, that project is now complete and stabilized, and it turns out that it was the first CLT apartment building ever built in NYC, which is quite an accomplishment.

On her blog, Joanne describes the project as being a "labor of love", and that certainly sounds right. But they are now also onto their next CLT apartment building at 122 Waverly Avenue (called Frame 122).

This would suggest that whatever their development model is, it is working for them. My assumption is that they want to both make our cities more sustainable and own high-quality rental assets for the long-term (possibly forever).

If you'd like to see how 122 Waverly was assembled, here's a short video that Joanne recently posted on her blog:

I had an interesting meeting today talking about the structural approach behind this OMA-designed project in Brooklyn (pictured above).

I have always found structural engineering fascinating. Structures, along with physics, were some of my favorite classes from high school all the way to grad school. So even though I don't think my personality is ideally suited to engineering, if I were ever to become an engineer, I'm fairly certain that I would need to be a structural one.

For this project the big structural challenge was the large cantilevers that you see above in the tower on the left. As I understand it, there a number of ways to deal with this. One way would be to just design large transfer slabs and/or beams. But given the size of this tower, these would end up being very deep, and so you'd be really compromising the spaces where these structural transfers occur.

How they actually dealt with it is through sloping columns (which you can see in the above photo if you look closely). What these columns do is gradually transfer the loads across multiple floors in the building, until they reach structure that runs all the way down the tower.

At the same time, the spaces underneath the sloping columns are essentially "hung" from above. Meaning the columns are in tension, instead of being in compression, which is typically how columns work. The result is that you get some sloping columns in the suites. But I think that's kind of cool. If you're nerdy enough to care, it tells you how the structure of the building is working.

Obvious disclaimer: I am not a structural engineer. You probably want to consult one if you're looking to do a cantilevered tower with sloping columns.

Photo: Elevated Angles via Highbury Concrete