After a four-year delay, Boston-based Spaulding Rehabilitation Hospital is resuming plans to move out of its current building into a $200 million facility. Spaulding is proposing to build an eight-story hospital with 132 rooms, down from its current number of beds of 196. The 221,000-square-foot facility would have larger rooms and an array of amenities, including swimming pools, therapy rooms, gyms, community space, and an outpatient clinic. Officials said the hospital's current building, built in 1970, is obsolete.