Dickstein Shapiro has closed in Washington DC and New York with almost all of its 100-plus lawyers moving to Blank Rome.

Blank Rome will now have more than 620 lawyers spread across the US, with the acquisition of Dickstein Shapiro expected to triple the size of its Washington DC office. More than 90 lawyers will join in the US capital, while 13 will be based in New York.

As a result, Blank Rome will be able to offer government contracts and insurance coverage advice for the first time, with the new practice groups led by partners David Nadler and James Murray respectively.

Dickstein Shapiro’s intellectual property team will also add to Blank Rome’s client base, with the group having already represented Toshiba and Samsung.

Blank Rome’s managing partner and chairman Alan Hoffman said the deal was “in line with our current strategic plan” and is “the latest in a robust series of targeted lateral hires, acquisitions and combinations”.

A statement on Dickstein Shapiro’s website said the firm was “no longer engaged in the practice of law”.

It was reported last year that Dickstein Shapiro had been attempting to push through a merger with Bryan Cave. Dickstein Shapiro most recently reported gross revenues of $192m (£132m). Blank Rome’s turnover is almost double that at $331m.

It is not yet known where Dickstein Shapiro’s lawyers in Los Angeles will resurface.