Owners of rowhouse properties in Washington D.C. will no longer be able to add height and density by building pop-ups. The construction provoked the ire of aesthetically minded critics and, now, the regulatory controls of the District's zoning code.

"The District’s Zoning Commission gave final approval Monday night to new regulations governing the 'pop-up' homes sprouting up in some of the city’s gentrifying neighborhoods, reducing the maximum height of single-family rowhouses to 35 feet from 40 feet," reports Ian Shapira.
"In a surprising reversal from a preliminary vote in late March, the commission also voted to limit developers to building two 'by-right' condo units in a pop-up, a renovated rowhouse with an added story or added stories often towering over neighboring homes. A third or fourth unit would require a special exception from the city."
According to Shapira, the decision concludes a contentious debate that persisted for over a year across the District. The article includes more detail about the politics of the decision and provides soundbites from the commission hearing.
FULL STORY: D.C. zoning panel approves new regulations for pop-up rowhouses

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City of Albany
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
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Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research