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The Chicago police department operates an off-the-books interrogation compound, rendering Americans unable to be found by family or attorneys while locked inside what lawyers say is the domestic equivalent of a CIA black site.

The facility, a nondescript warehouse on Chicago’s west side known as Homan Square, has long been the scene of secretive work by special police units. Interviews with local attorneys and one protester who spent the better part of a day shackled in Homan Square describe operations that deny access to basic constitutional rights.

Alleged police practices at Homan Square, according to those familiar with the facility who spoke out to the Guardian after its investigation into Chicago police abuse, include:

Keeping arrestees out of official booking databases.
Beating by police, resulting in head wounds.
Shackling for prolonged periods.
Denying attorneys access to the “secure” facility.
Holding people without legal counsel for between 12 and 24 hours, including people as young as 15.
At least one man was found unresponsive in a Homan Square “interview room” and later pronounced dead.

Brian Jacob Church, a protester known as one of the “Nato Three”, was held and questioned at Homan Square in 2012 following a police raid. Officers restrained Church for the better part of a day, denying him access to an attorney, before sending him to a nearby police station to be booked and charge

Unlike a precinct, no one taken to Homan Square is said to be booked. Witnesses, suspects or other Chicagoans who end up inside do not appear to have a public, searchable record entered into a database indicating where they are, as happens when someone is booked at a precinct. Lawyers and relatives insist there is no way of finding their whereabouts. Those lawyers who have attempted to gain access to Homan Square are most often turned away, even as their clients remain in custody inside.

“It’s sort of an open secret among attorneys that regularly make police station visits, this place – if you can’t find a client in the system, odds are they’re there,” said Chicago lawyer Julia Bartmes.

Chicago civil-rights attorney Flint Taylor said Homan Square represented a routinization of a notorious practice in local police work that violates the fifth and sixth amendments of the constitution.

“This Homan Square revelation seems to me to be an institutionalization of the practice that dates back more than 40 years,” Taylor said, “of violating a suspect or witness’ rights to a lawyer and not to be physically or otherwise coerced into giving a statement.”

Much remains hidden about Homan Square. The Chicago police department has not responded to any of the Guardian’s recent questions – neither about any aspect of operations at Homan Square, nor about the Guardian’s investigation of Richard Zuley, the retired Chicago detective turned Guantánamo Bay torturer. (On Monday evening, it instead provided a statement to MSNBC regarding the Guardian’s Zuley investigation: “The vast majority of our officers serve the public with honor and integrity,” said the statement, adding that the department “has zero tolerance for misconduct, and has instituted a series of internal initiatives and reforms, to ensure past incidents of police misconduct are not repeated”. Without providing any specifics, it claimed “the allegations in this instance are not supported by the facts.”)

When a Guardian reporter arrived at the warehouse on Friday, a man at the gatehouse outside refused any entrance and would not answer questions. “This is a secure facility. You’re not even supposed to be standing here,” said the man, who refused to give his name.

A former Chicago police superintendent and a more recently retired detective, both of whom have been inside Homan Square in the last few years in a post-police capacity, said the police department did not operate out of the warehouse until the late 1990s.

But in detailing episodes involving their clients over the past several years, lawyers described mad scrambles that led to the closed doors of Homan Square, a place most had never heard of previously. The facility was even unknown to Rob Warden, the founder of Northwestern University Law School’s Center on Wrongful Convictions, until the Guardian informed him of the allegations of clients who vanish into inherently coercive police custody.