LynLake branding (logo stamped concrete) extends eastward to Grand Avenue. Pretty hard to argue these sites are not in LynLake when the logo is literally stamped into the adjacent sidewalk. Though due to all of the parking lots, car lots, vacant lots, etc. in the area, it currently does feel like the district terminates immediately at Garfield Ave.
If you want to get super technical, the city's
Lyndale-Lake Special Service District actually extends all the way from Dupont to Blaisdell, though that broader definition is not the same thing as the narrower LynLake business district (logos, banners, etc.)