Not sure what state you are, but here your lease wouldn't be "void"  Anything that conflicts with the code would be (landlord-tenant code supersedes leases in DE anyway)I would just say you had them sign an older version of your lease in error and need them on the current one.

A long-term rental gives you a steady, predictable income as you ease into being a landlord.

That way your monthly expenses will be significantly less, you'll be gaining experience as an investor/landlord, and you'll be able to purchase your next property quicker.

You don't sound like you want to do the work of a landlord to be honest.

Quote from @Spencer Herrick: From the internet:Tenants in Pennsylvania must give their landlord written notice if they want to end their lease agreement for any reason.

It's more landlord friendly than CA.

Landlord pays water/trash. 3 units well under market (long term tenants over 7 years) market rents would allow for $6000 month ($750 per unit) There is no laundry at property.Turn key investment

It's the easiest way to try being a landlord without dealing with tricky renovation projects.

The lease agreement between my wife and LLC will have a clause saying subleasing is allowed and no permission will be required from landlord.

If you choose this route, make sure to have clear, written agreements in place and maintain a professional landlord-tenant relationship.