@Greg Scott is correct, that many commercial brokers only deal with end buyers and there is no co-broke, but there are many that still do. 50 commercial multifamily properties are currently on the market in Phoenix that offer a co-broke commission to your buyer's agent, and even the ones that are marketed off the MLS can still offer co-broke.

A Co-Host is a Property Manager and will need a real estate license regardless of whether or not the property is a vacation rental and/or short term rental.2. 

If you are purchasing a SFR than you could use your sister as a co-signer. 2 - 4 units requires 25% down if you are using a co-signer, even if it is family. 

For a MFR you can’t use a co-signer with the 3.5% down payment for FHA.

I only invest in multi-family and don't let potential tenants with violent histories in my properties, but if you're comfortable with letting one of these tenants in I would check and see if either can get a co-signer as that will help minimize the low credit score and you can go after the co-signer (as well as the tenant) in the event there's an issue with rent or damage to the rental. 

Is there a chance that you can have a co-signer on your loan?

My income has declined so much that I'd likely need to get a co-signer for a loan and I have always been very resistant to taking on debt. 

We received a lead through probate from a seller with an inherited property that's in a co-op and needs to sell fast. 

Plus, may be hard to get a CO if you have an extra apartment.

My income has declined so much that I'd likely need to get a co-signer for a loan and I'd be relying heavily on the passive income from my investment(s).