@Brett JurgensSolar on my house would be around $40k and my electric bill is not even 200.

I initially planned on doing month to month lease for incoming tenants just in case I need to let them go if they end up not being the right fit.

A few thoughts on this... 

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.

Good afternoon, I just closed on a multi-family property (4 plex in an older home) . 3 units are rented, 1 is vacant and there is a shared common area for laundry.

The windows, roof, electricals, plumbing systems, and gas lines all need major upgrade to bring the property up to date. 

Any advice on how feasible this is?

Hey Renee,It depends on your short term and long term goals.

lean on these forums whenever you have questions. good luck with your investments.

@Sam Peterson You can utilize different online companies (web, phone apps, etc.) for this but if you're new to REI you could gain traction by making your own.