I have been mapping historic French LA for 8.5 years.
It's harder than it looks. Among the many, MANY changes to the street grid, the intersection of Alameda and Aliso was erased, with Aliso rerouted into Commercial at Alameda Street in the 1950s to accommodate the 101 Freeway.I get a lot of questions about this, and I think it's easier to explain with maps.
This 1894 map detail shows the Maier and Zobelein brewery, formerly the El Aliso winery, in the bottom left corner. By this point, Jean-Louis Vignes' vineyard (formerly ground zero for the French community in LA) had been thoroughly developed into a mostly-residential neighborhood, and was still full of French residents like the Ducommuns, the Lazards, and Joseph Mascarel (who died in his Lazard Street home just a few years after this map was made). Maier and Zobelein was rebranded as Brew 102 in the 1940s, with the brewery tanks easily visible from the freeway and in photos.
Zoom in and you can see that Ducommun Street (misspelled here as "Ducummen") and Lazard Street were once two separate streets. Today, it's all Ducommun and it no longer reaches all the way to Alameda Street.
When the original street grid has been altered to this extent, mapping French LA is a bigger challenge than everyone thinks it is. On top of that, LA added numbering fairly late. I do still plan to reveal the Great Big Map of French LA someday; I'm just not sure when (or if) I'll ever be "done" enough.