Thanks to both Hannie and GK for the suggestions. Sorry about the delay in getting back to both of you.
I just had Margie review the project and she said it's good to go.
Here's what I did.
I was working on what Ctein said in his book, Digital Restoration Start to Finish, that any color shift in a black & white photo represents damage. As you can see from the Problem 1 and Problem 2 images there are two types of damage.
I used the image shown under Problem 2 which shows Orange in the corners of the building. I created a mask based on the orange and then I was able to control the orange using Color Mixer and used it to make it lighter as to blend with the background. This also gave me pretty good detail with the people and foreground.
The image shown in Problem 1 was too wide spread and no matter what I tried I could not create a mask which would isolate it and allow me to control it. So in Camera Raw I adjusted the image to provide the best background that closely matched the adjustment that removed the orange in the above image. The intent was to balance the color across the background.
This gave two separate images which I combined with a mask pulling the fore and mid ground from one and the background from the other. Call this the Master1.
I still was missing detail from the background, in particular the lettering. So I took the combined image, as a separate copy, and multiplied it up 3 times and then adjusted with a curve to pull as much detail as I could. This gave me an image with a lot of contrast but with detail.
I combined this image with the Master1 image using a mask to pull in dark details as required.
This gave Master2 image which still had a mottled effect (like drops of water on a watercolor painting). I went over the whole photo with dodge and burn tools to even this up as much as I could. In the highlights it was necessary to use the smudge tool to even out the color further.
I worked over the details again with dodge and burn (in particular the lettering, electric light cords and windows). Plus, clone stamp, patch tool and then a crop to finish the edges.
This photo still has unrecoverable damage particularly in about 15 faces, which you can see highlighted with red rectangles here:

Here's a B&W copy of the final image.

GK, thanks for the tip on calculations. I think this will be a help in the future but I have to spend some more time figuring it out. It looks like it would be a great way to create the mask in Problem 1 that I could not figure out. I'll keep working on it. BTW, you can call me, Jon.
Hope this information, helps others.
Regards,
Jon