@Marjorie Josaphat : Speaking strictly from a financing view, getting a loan for 2 4-plexes may be easier than getting a loan for a single 8-plex. And then again, maybe not. :) Confused? let me break it down.
1-4 units: this falls under traditional "residential" financing, that you may already be familiar with from single-family. Any mortgage residential mortgage broker you find online can do these. You will get very similar product offerings (30 year fixed, 5-10 year arms, no pre-payment, LTV, etc.) They are very easy to find and to shop. Their loans are based on your personal credit, DTI and ability to pay, etc.
Above 5 units is considered "commercial." Here you need to find more specialized lenders/brokers. You will see a very wide range of product offerings in terms of loan-term, amortization, recourse, interest rates, LTV, interest-only periods, and pre-payment penalties. So, you are able to select loan products that are a closer fit to your individual needs, but they may be a little harder to find, as there are few central marketplaces for them.
The gold standard for loans in the $1M-3M range (in my opinion) is the Freddie Mac SBL loan. If you're in that range, then I would encourage you to ask around your network for brokers who work in that program.
Hope that helps!
James Kojo