If you're thinking ~32/35mm tires, a touring frame would be better, but might not be as lively to bomb around on. Better for mounting racks though. There's a Trek 520 on Sacramento CL (no relation) that could be fun and might fit him for a couple of years.
https://goldcountry.craigslist.org/bik/d/standard-1984-trek-520-touring-bike/7101777951.html
IanA
I'd be looking for off-premium sport touring with eyelets for racks. Off-premium meaning not a canti touring, or for example, a True Temper (late 80s) era Trek vs the earlier 531 Treks. My sweet spot would be seven speed cassette or better, fat enough tires and a noticeable dent in the top tube that won't affect the ride at all.
If social distancing allows, I suggest a trip to Trips for Kids/The Recyclery in San Rafael to look at used bikes. Not the cheapest, but supports charity work with inner city kids.
Carl
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Something inexpensive along the lines of my brother's old Miyata Sportcross grocery-runner might fit the bill. Was updated slightly from stock for a 3-week touring trip he took last year. Fit 135mm-spaced modern wheels with 42mm Schwalbe rubber without trouble. Plenty of early-mid 90s steel hybridity floating around Craigslist / Facebook... a couple photos just before it found another owner:
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