The longest I have seen in modern conventional home construction now is 60yrs.On flip side of coin, there is a laundry list of potential nightmares: failing foundation can be intensly expensive to repair as 2'+ foundations was common and is extra expensive to address vs conventional.

I would NOT make them coin operated.

Coin Laundry questions!

There are also two coin operated washers and two coin operated dryers in the basement.  

This was before the phrase "Airbnb Arbitrage" was coined, and all my friends thought I was crazy.

It's highly unlikely that your tenants will happen to own gold or silver coins, foreign currency, or cryptocurrency that they can pay you with.

Should I buy electric coin laundry machine and plug it from there or should I buy the regular ones...Thank you in Avanced .

Lessons Learned:1) Walk through with your contractor before making an offer to spot problems and to tighten up your offer;2) The calls come when you open the walls - contingency is important;3) Having a good contractor makes life easier;4) Keep receipts for everything - got my CO in the final hour because we could prove door from garage was solid wood;5) Take a moment to enjoy the process.

The flip side of the coin is that single-family tenants can sometimes be more long-term. 

@Jerry Happoldt I've been on both sides of the coin so I understand the issue.