New options within the same community.
There's information that living alone results in a more rapid decline and earlier death, so being around other people is the critical piece. It also should enable attending the same church, library, community center and seeing all the same neighbors.
And they need to be mixed within the neighborhood.
Take a partial empty block like Linwood and Brooklyn
Imagine the street side is treated like row home apartments where someone gets their own entrance with a bedroom and bathroom, their own front garden and all that. But every unit is part of a single interconnected building.
Each unit has a back door into common spaces like a shared dining room. There's laundry facilities, a kitchen, libraries and the like.
The idea is there's a staff on site to help with things and add on services as someone ages. Some residents get medical help, some get transportation and some it's just a place to live with their peers. Some structures could get away with being smaller, like you could cook centrally and have a 4-6 unit building food is delivered to.
Can tailor the exact details to the neighborhood and available space. Like along Linwood could use landscaping and glass walkways to connect a three story apartment building to the rest of the structure.