Should the height limit change?
The law restricts buildings to 20 feet taller than the adjacent street, up to a maximum of 90 feet on residential streets, 130 feet on commercial streets, and 160 feet on Pennsylvania Avenue downtown. In most neighborhoods, local zoning is more restrictive.
Arguments for changes
Supply is too low, making the rent too damn high. Downtown DC has the lowest office vacancies in the nation and very high rents. This means that some high-revenue businesses, like law firms, take up a lot of space while technology startups might have a very hard time finding offices.
It's arbitrary. Someone (maybe Matt Yglesias) made a good point on Twitter recently: If the height limit had been 200 feet, would many people insist that 200 is the perfect height for DC? It's a myth that the limit has anything to do with the height of the Capitol dome or any other structure.
It impedes good design. Most attractive buildings have some variation in their shape. The base might come all the way to the street, but then farther up, the building is set farther back, and has interesting cut-outs and curves. With a height limit, it creates an enormous economic incentive to build a box filling the lot.
It impedes other amenities. NoMA has no parks. Why? Because all of the landowners say that they can't afford not to fill their whole lots. If DC could give a couple of buildings permission to build taller if they give up some of their land for a park, it could make the neighborhood much more livable.has suggested taller buildings east of the river. There are tall buildings right across the Potomac in Rosslyn. Why not across the Anacostia too?
Arguments for the limit
It encourages more infill. Go to a lot of midsize US cities and the downtowns have a few big towers with lots of empty space for parking in between. Those empty spaces create walking dead zones. The District has almost no empty lots downtown, and even space on top of freeways like the Center Leg I-395, or the Union Station railyards, will be covered over. That's because land is so valuable (thanks to the height limit) that it's economical to build decks for buildings.
It pushes growth to other neighborhoods. Near Southeast and NoMA are booming because downtown had to spread somewhere. Without a height limit, there might never have been an incentive to transform them. Anacostia, Saint Elizabeths, Minnesota-Benning, and Rhode Island Avenue could see new growth as well. The companies that can't afford to locate downtown can go to these neighborhoods and bring new residents, amenities, and jobs.
However, the growth in other neighborhoods is a double-edged sword. NoMA's growth is bringing more gentrification to Bloomingdale and Eckington, and potentially pushing out the Florida Market wholesale food market. With limited supply, more neighborhoods become unaffordable.
It can also make neighborhoods more office-heavy and less residential. Foggy Bottom has changed enormously from a generation ago. Dupont Circle was moving aggressively in that direction before some strict zoning and historic preservation limits halted the trend. Reduce the pressure to develop outside the core, and fewer legal restrictions would be necessary or desirable.
Rosslyn is damn ugly at ground level. The flip side of the Rosslyn argument is that as an urban place, Rosslyn is not the most exemplary. Most of this is actually a consequence of its buildings dating to an era when towers set far back from the street, with large concrete plazas, was in vogue, so it suffers not from too-tall buildings but from bad urban design. Still, there's less incentive to fill in those plazas than there would be in downtown DC with the height limit.
It gives the monuments more emphasis. This is the main argument from the National Capital Planning Commission. DC should focus on the monuments, and a lower, more horizontal skyline means that the Washington Monument, Capitol, and National Cathedral and National Shrine dominate the skyline instead of a striking private sector tower of some kind.
How can it change?
Are there ways to change the height limit that don't spoil its positive effects? Here are a few that have come up in previous debates:some careful design.
The federal government transferred the land to the District, with the proviso that most of the site stay parkland. That means there's no reason to want the economic incentive to spread out the development; instead, it's better to have an incentive to focus it.
More growth there would house a lot of residents and jobs, bring people across the river, create a customer base for businesses in Historic Anacostia where the buildings won't get tall, and ease demand elsewhere.
Grant a few exceptions for exceptional design and amenities (the Malouff plan). Let some buildings go just a little bit higher, but not by right. Instead, they could do it if that allows a really interesting, attractive architectural design, and if the building provides some amenities, like parks or daycares or libraries or something that won't otherwise be economically viable in the tight downtown market.
Auction off height waivers (the Avent plan). Define a set of zones where a few taller buildings might be okay and a few where they're not, like key viewsheds. Auction off a limited number of permits per year for building up to a somewhat higher limit. This would prevent a stampede to tear down perfectly good buildings just to add a few floors, but would also create a more varied skyline with a few taller buildings, which would be much more aesthetically interesting.
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