If the following:
$7500 X 52 weeks is 400K per year (not including sales taxes!)
$3500 month (total not 3net) is $42K per year
Rent is higher than ideal but if sales rose to 8500 a week not impossible to live with. There are some people that enjoy occupancy costs that are half that, but in many areas, that is very much what you will find.
It is certainly possible that the seller makes 60K on those sales with that rent. In my store, running it day to day myself I would make that on those sales with that rent.
You are correct to shy away from opening from scratch with 70K. We have had that go-round on the boards many times with some advocating that starting from scratch can be done for less. No doubt it has happened, but the usual experience is quite different and more like what some of the other comments reflect, 18 months and 150K later…
If the overall condition of the place is good and equipement is updated, I like the sound of 45 years history. If the equipment is 45 years old and so is the tile, the walk-in, etc etc, I would have some concerns that you are looking at some expensive equipment and maintanance issues.