Massachusetts General Hospital says it will spend more than $1 billion to expand its Boston campus.
Hospital President Peter Slavin announced the plans in a Tuesday email, saying the hospital will build a 12-story structure for 450 single-bed rooms housed in a pair of connected towers.
The new additions will be located entirely within the hospital's current campus, with a facade to go along Cambridge Street.
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MGH, which is owned by Partners Healthcare, will file a letter of intent with city planners at the Boston Planning & Development Agency Wednesday.
Slavin says the development is planned to start in 2020 and be completed by 2026.