love to see a tweet like this, and then the poster is replying to everyone asking "but aren't these pretty inaccessible for elderly and disabled people?" by going "well, the ADA doesn't apply to 2-family houses"pic.twitter.com/XjWPPBYfke
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
don't get me wrong, I'm pro-density, I love neighborhoods that look like this, I just think people shouldn't be dismissive of accessibility needs on the grounds that "the ADA doesn't require it". Surely these designs can be revised to be more accessible.
in one of the threads, someone suggested interspersing buildings of all accessible units, and separately, having 4-over-1 type buildings with first-floor commercial on the block corners, and those both seem like reasonable ideas to me.
(another suggesting: roof decks on those rowhouses, which, yes, absolutely. but maybe also solar panels!)
the original tweet had a followup showing narrow, fenced backyards behind each unit, and I like that, but I also think you'd want (lockable from both sides) gates in the fences, so you can interact with your neighbors across the back fence without going around the whole block.
also every few blocks, maybe every half dozen or so, there should be a small square block that's just a little park.
I had a house cleaning client who lived in the basement unit of a place like this in Southie. It had a level walkout entrance at the rear - fairly accessible! The upper unit would be less so, lots of stairs.
yeah, I'm sure they _can_ be made more accessible than they look in this render, but the guy's only response being "the ADA doesn't apply to this" is…disappointing
Also, everyone knows families don't have any disabled and elderly people in them - how gauche! 
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.