The banks would factor in the pre existing income from the remaining 3 tenants into the size of the loan you would have to carry in order to take ownership of this 4 plex. 

Liability is for events not property.

2) Do factor in the same % for vacancy, maintenance, etc. as you would a SFH?

You also want to factor that you are going to be able to get a $700K property with just 3.5% down.

There are a million parks - don't get excited over any one individual one.You haven't told us a few critical factors in valuing your park:1 - What the lot rents are2 - How many lots total there are3 - Are any of the park owned homes vacant, and if so - how many are vacant?

There are many factors here. 

In the context of financial services, secondary legislation is generally legislation that has been drafted by a regulatory body empowered to do so pursuant to the primary law by which it is established.It is also important to recognize the importance of several other important factors: Regulatory Codes, Rules, and Regulatory Guidance Notes when determining a course of action.

My guess is that there are a couple of factors adding to the challenge here.

As far as managing, I am factoring in the cost of PM when doing my numbers, I just hope I'm able to find reliable PMs.

This is the prescription phase, where you show the Seller that your service is the best available treatment, taking all the factors of the Seller’s situation into consideration for their pain.