The federal government has extended its lease on a downtown property used by U.S. Immigration and Customs Enforcement, according to federal lease records and the building’s owner.
The property at 310 E. Knapp St. is owned by the Milwaukee School of Engineering but will remain in use by the federal government through at least April 2026, with options to extend through 2028, said JoEllen Burdue, the college’s senior communications director.
“We do not have immediate plans for the building and will reevaluate next year when we know whether or not the government wants to extend the lease,” Burdue said.
The lease was originally scheduled to expire in April 2025.
With a new ICE facility under construction on the city’s Northwest Side, the downtown lease extension raises the possibility that the federal government is expanding local immigration infrastructure or enforcement. This would be consistent with other forms of expansion in immigration enforcement, statewide and nationally.
“I’m upset and concerned about what this means for my immigrant constituency. For my constituents, period,” said Ald. JoCasta Zamarripa, who represents the 8th District on the South Side.
Immigration infrastructure
The Knapp Street property is used by ICE as a field office for its Enforcement and Removal Operations, according to ICE.
This includes serving as a check‑in location for individuals under ICE supervision who aren’t in custody and a processing center for individuals with pending immigration cases or removal proceedings.
According to a Vera Institute of Justice analysis, the number of people held at the Knapp Street location has been increasing.
The Vera Institute is a national nonpartisan nonprofit that does research and advocates for policy concerning incarceration and public safety.
The most people held by ICE at a given time at that Knapp Street location during the Biden administration was six. On June 3, 22 people were held there – also exceeding the high of 17 during President Donald Trump’s first administration, according to data from Vera Institute.
The office generally does not detain people overnight but can facilitate transfer to detention centers that do.
The functions carried out at the Knapp Street office mirror those planned for the Northwest Side facility.
City records show the West Lake Park Drive property will be used to process non-detained people as well as detainees for transport to detention centers.
The records also state that the property will serve as the main southeastern Wisconsin office for immigration officers and staff.
The U.S. General Services Administration, the federal government’s real estate arm, initially projected the new site would open in October. However, a spokesperson said there was no update and did not confirm whether that timeline still stands.
Neither ICE nor the Department of Homeland Security, which oversees ICE, responded to NNS’ requests for comment.
Rise in immigration enforcement
As local immigration enforcement grows, so does enforcement throughout the state and the rest of the country.
Nationally, the number of immigrants booked into ICE detention facilities increased in less than a year – from 24,696 in August 2024 to 36,713 in June 2025, according to the Transactional Records Access Clearinghouse.
The Transactional Records Access Clearinghouse is a nonprofit at Syracuse University that conducts nonpartisan research.
Not only are more people being detained, but they are being detained for longer, said Jennifer Chacón, the Bruce Tyson Mitchell professor of law at Stanford Law School.
A July 8 internal memo from ICE Acting Director Todd Lyons instructs agents to detain immigrants for the duration of their removal proceedings, effectively eliminating access to bond hearings.
Eighty-four of 181 detention facilities exceeded their contractual capacity on at least one day from October 2024 to mid-April 2025, according to a July report from the Transactional Records Access Clearinghouse.
The Dodge County Jail – which ICE uses to detain people apprehended in Milwaukee – is one of the facilities that exceeded its contractual capacity. On its busiest day, it held 139 individuals – four more than its 135-bed limit.
In addition to Dodge County, Brown and Sauk county jails have also entered into agreements with ICE to house detained immigrants, according to records obtained by the ACLU of Wisconsin.
ICE’s unprecedented budget
Noelle Smart, a principal research associate at the Vera Institute, notes that it remains unclear whether increased immigration enforcement drives the need for more detention infrastructure or expands to catch up with more infrastructure.
But, Smart said, with ICE’s unprecedented new budget, the question of which one drives the other becomes less relevant.
Trump’s proposed ICE budget in 2025 was $9.7 billion – a billion more than ICE’s 2024 budget. An additional $29.85 billion was made available through 2029 for enforcement and removal as part of the “One Big Beautiful Bill Act.”
“We know this administration intends to vastly increase the number of people subject to arrests and detention, and we expect to see increases in both given this budget,” Smart said.
Jonathan Aguilar is a visual journalist at Milwaukee Neighborhood News Service who is supported through a partnership between CatchLight Local and Report for America.
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