A buyer is closing in on a purchase of Dallas’ tallest skyscraper.

The 72-story Bank of America Plaza has been up for grabs since earlier this year.

The 1.85 million-square-foot Main Street office tower outlined with miles of green lights has been owned since 1998 by Metropolis Investment Holdings, a Chicago-based real estate firm that manages assets for a German family investment group.

The landmark high-rise is about 70% leased to major tenants including Bank of America; Cowles & Thompson PC; Zelle LLP; Carrington, Coleman, Sloman & Blumenthal; and Global Health.

The last time Bank of America Plaza sold, it fetched more than $300 million.

Dallas’ Stream Realty Partners is leading an investment venture seeking to purchase the tower, according to real estate brokers tracking the deal.

Stream Realty has just completed a $140 million redevelopment and expansion of the Trammell Crow Center office tower on Ross Avenue.

Stream Realty officials and executives with Cushman & Wakefield — which is marketing the Bank of America Plaza — aren’t talking about the pending sale. But the transaction is expected to close in early 2020.

Bank of America Plaza is one of Dallas’ most iconic buildings, but the skyscraper has had only specific upgrades since it was completed in 1985. The owners replaced Bank of America Plaza’s 9,000 feet of exterior lights with new LED bulbs in 2013. They also built a new entryway on Main Street.

But the tower’s current owners didn’t move ahead with plans to build a 15-story, 1,500-car parking garage on Commerce Street that would serve the building.

And some high-profile areas of the property, including the lower-level food courts, haven’t had an upgrade since the ‘80s.

Bank of America is the last of the signature 1980s towers on Dallas’ skyline not to have a complete overhaul — something buyers are expected to undertake.

It’s one of several downtown buildings in play, including the recent sales of the KPMG Plaza, 1900 Pearl office tower and AT&T’s Whitacre Tower.