By being a co-signer, that person has committed to pay the full amount of any debt or fully satisfy any obligation or responsibility.In effect, they are more committed than an investor who puts up only cash.

We put a contingency in the contract for the inspection so if it will cost too much then we won't be purchasing it.I just spoke with a licensed commercial inspector about obtaining a CO and he said it shouldn't be too hard to get.

Have them fill out an application and run them as if they are a tenant, and add a co-sign agreement.  

your other tenants should have 100% liability each- not 1/3 each. let them know that accepting this person as a co-leasee they accept future liability.

The way the Washington State Fire Code is written it sounds like we need to install a smoke detector and a CO detector in all bedrooms that have a heat vent from the furnace.

Have the parents as a guarantor as opposed o a co-signer.

I work in a co-working space in NYC and it's mostly composed of real estate startups all with a different bit of an edge. 

Also- what about a co-signer? 

Registering as a landlord is something I luckily remembered because I have a co worker who had to evict a tenant.

Alex Chin if she needed a co-signor to get the home would it still be a worthwhile investment for her through an FHA loan?