As far as New York City addresses go, 70 5th Avenue may not ring a bell but the building that stands there housed some of the most important civil rights campaigns of the 20th century and recently moved closer to being landmarked by the city.

“While here, the NAACP undertook groundbreaking, successful campaigns which affected the lives of millions and altered the course of history in our country,” wrote Geoffrey E. Eaton, President of the organization’s Mid-Manhattan branch, in a letter supporting landmark status.

The New York City Landmarks Preservation Commission has not set a date for a public hearing, which is likely to take place in the coming months.