Compared to my first visit decades ago to the sad state of affairs it is currently in, DF's Barrio Chino is on what it appears to be its last legs. Much like many of the other Chinatowns in Latin America, the once vibrant and celebrated areas have made their cultural mark in society are now on the brink of extinction. I would recommend checking it out for anyone who is curious, but curb the expectations of anything feeling remotely Chinese.
A stone's throw away from the Palacio de Bellas Artes are the remnants of what's left: A red lantern filled street along Dolores Street, stretching to about 2 blocks of Asian themed businesses. It feels gimmicky, but still alive; likely a far cry of what it was less than a generation ago.
Many restaurants have come and go, but there aren't many left in this touristy alley way. One could argue Hong King 好景樓 (https://www.yelp.com/biz/hong-king-ciudad-de-m%C3%A9xico) is the most "authentic" spot left, but that's not really saying much. There are are better Chinese restaurants in other parts of DF, but even then, Chinese cuisine certainly isn't the city's strong suit.
For tourists, come for the sake of saying you've been there. There really isn't much to see or eat, but I assume the tourist dollars that go to all the imported Asian souvenirs will manage to go to some cause. Or at least go for a photo, it's only a matter of time before this Chinatown meets the fate that other nearby countries and communities have already seen. read more