Because the dulpex is older than 1977 it probably has lead based paint, but that is true for everything that old. If the property has been painted the lead based paint should be encapsulated. The concern for lead based paint is two things, one when doing renovations you'll be exposed and two if there is ever any chipping paint and a tenants child eats it. If you keep your property in good repair and let the tenants know about the lead based paint your fine. There is a little booklet your supposed to give all your tenants if you move forward. I can give it to you if you'd like.
Sump pumps are not ideal because if they fail you get water in the basement, they have to be well maintained. You can look into foundation issues, if it has them there are clear signs like settling, windows that are no longer straight and doors not closing properly.
Mold, if you move forward as for it to be taken care of fully or ask a price discount.
Some switches for $12,000 is way to high. I just negotiated for the seller to pay for my buyer to have a 1935 house rewired and that cost was $6,000 and it was a lot of extra work, the bid was $4,000.
In sugar house doing the nicer renovations will get you closer to the $400k ARV and it's the type of neighborhood where tenants appreciate the extra nice finishes I don't know if laminate flooring is the right way to go.
The numbers don't work for a flip $400,000 ARV *.75=300,000 which would mean your renovation costs would need to be $40k for both units and I think that is pushing it to do two kitchens and two bathrooms. If your looking for a nice buy and hold that will have some equity once your done that might be the route. From the sound of it there is no way this property will go traditional FHA financing. (The house has to qualify for the loan also) Hard money or private money is the route I would go if I where you.
I don't think I'd walk from this just yet, get better bids and find out if you can get the financing. It has a lot of potential.