400 west 42nd street aka 577 9th avenue has plans that were filed a few months back for a new 28 story building rising to a height of 341 feet with 45 units. About two years ago, the plan was to built a hotel and condo but the original architect was scrapped and new plans were filed.
It is not clear for the plans filed with DOB if this building will be a condo or a rental. The building is located at the corner of 9th avenue and 42nd street sandwiched between the Orion at 350 W 42nd street and the MIMA tower which is a rental in the middle of Midtown west/Clinton block.