My take is to leave the existing meter/main in place as it is grandfathered as it is. Put a new sub panel inside somewhere and make new home runs for the existing circuits to it. It's a lot of work,
.... From the shot with the foothills in the background, is that the Rancho San Miguel development in Walnut Creek?
that was plan B
but the buss is only rated for 55a Cb
yep it’s San Rafael , near flw civic center