An 82-year-old man is evaluated for discharge planning. He was hospitalized with community-acquired pneumonia complicated by respiratory failure and sepsis, which required prolonged mechanical ventilation. He eventually required a tracheostomy and remains on mechanical ventilation, but his respiratory status is otherwise stable. He is severely deconditioned and has been unable to participate even minimally in physical therapy. Although he is expected to require mechanical ventilation for at least several more weeks, he is medically stable for discharge. Medical history is significant for chronic kidney disease, heart failure, hypertension, and type 2 diabetes mellitus. Medications are insulin aspart, insulin glargine, carvedilol, furosemide, and lisinopril. On physical examination, the patient is alert and cooperative but appears frail on mechanical ventilation. Vital signs and the remainder of the examination are normal. What is the most appropriate discharge disposition for this patient?