I might call a roofing supply and ask what and who they'd recommend.

We also lend them our VIP discounts for HVAC, plumbing, etc.. as well as supply stores.

@Angeline Rebottaro, I'd recommend leaving wet wipes or cleaning supplies for guests.

Since this is going to be our first purchase, we are specifically interested in buying a four-unit (to maximize leverage through FHA), preferably on the peninsula.We have been doing research, reviewing past sales, and observing the market for about 3-4 months and understand that the supply in Portland has historically been low, so instead of only waiting for MLS listings, we decided to ask around to see if there are other ways to connect with potential sellers. 

Or the specific supply houses (Eg a roofing supply house will probably refer you to some reliable local roofers) 

Is there an over-supply of cheap housing in your area? 

Speaking of your major, I would recommend Finance or Supply Chain.

We now have 1.68 months of supply or -26.8% less listings than last year, for all residential properties in the market! 

The fact that we have almost no supply, particularly in the lower price points, that's the story here. 

Because if you get 20 sellers and get all these tapes and never buy from them, you are just another window shopper in their eyes.