A long-awaited redevelopment in Courthouse appears poised to take the next step forward this year.

The “Landmark Block” is a full block of low-slung commercial buildings across from the Courthouse Metro station, which include the former Cosi, Boston Market and Jerry’s Subs restaurants, and the current Summers Restaurant and Mattress Warehouse. According to a presentation by Arlington’s planning division to the County Board yesterday, county planners expect developer Greystar to file redevelopment plans this year.

Planners anticipate the site plan filing being considered by the County Board by the end of the year, according to the presentation.

It’s unclear what will be built on the block, but there are some clues.

Greystar bills itself as the “global leader in rental housing,” suggesting an apartment building may be in the works. A planning process five years ago suggested that at least some of the building facades on the block would be preserved. And that same planning process — dubbed Envision Courthouse Square — resulted in renderings that depicted a tall tower on the current Landmark Block.

(The tower is just north of what is currently a large county-owned surface parking lot but envisioned as “Courthouse Square,” a large green park with underground parking below and subterranean connections to the Landmark Block and other nearby buildings.)

It’s anticipated to be a busy year for Arlington’s planning division, with some 15 major site plans expected to be considered in 2020. The post-HQ2 workload is also set to include land use studies for Clarendon, Shirlington and Lee Highway.