In 1977, Intiman opened year-round administrative offices in Pioneer Square and hired its first general manager, Simon Siegl. With a season of five classic plays, Intiman also embarked on the second year of "New Plays Onstage," a program that featured staged readings of contemporary works directed and performed by members of the ensemble. Over the next several years, the Theatre was awarded institutional status by the King County and Washington State Arts Commissions and a challenge grant from the National Endowment for the Arts. In 1982, it enjoyed the culmination of a three-year planning process with its participation in Scandinavia Today, an international exposition of Nordic culture that took place in five American cities. The Intiman presented staged readings of five contemporary works and two great classics on its main stage: The Wild Duck and A Dream Play, in collaboration with top Scandinavian directors, designers and playwrights.
Led by Megs Booker and Simon Siegl, Intiman began to prepare for a move to a new performance space after it was announced that the Second Stage - Intiman's home for nine seasons — would be demolished to make way for the Washington State Convention Center. Though Intiman was established as a cornerstone of the Seattle arts community, it was the only professional resident theatre in the area that did not have a permanent home. Over the next few years it operated in locations all over the city, including the Broadway Performance Hall, on short-term rental agreements.
In 1985, Peter Davis joined Intiman as its first managing director and engineered a complete restructuring of the financial and administrative areas of the company. A former scenic designer who had worked for both Intiman and Seattle Repertory Theatre, Davis negotiated a plan for Intiman to operate and manage its own facility — the Seattle Center Playhouse, located in the cultural heart of Seattle. Originally built for the 1962 World's Fair, the Playhouse was given new life with a $1.2 million renovation. For the first time, all of Intiman's operations were in one location — performance, rehearsal, production, shop and administrative areas. Holding a 22-year lease from the City of Seattle, Intiman moved into the renovated Intiman Playhouse at the Seattle Center in 1987.
In 1994, Intiman became the first regional theatre company in the country to be awarded the rights to produce Tony Kushner's two-part epic Angels in America after it won the 1993 Pulitzer Prize and Tony Award for Best New Play. Part One: Millennium Approaches closed Intiman's 1994 season, and Part Two: Perestroika opened the 1995 season. Directed by Shook, the complete Angels in America was the most successful production ever to be produced at the theatre, reaching more than 63,000 attendees over its two-year run. Over the next decade, Intiman produced plays by such provocative and influential American writers as Edward Albee, Moisés Kaufman, Ellen McLaughlin, Terrence McNally, David Rabe, Anna Deavere Smith, Paula Vogel, and Chay Yew.