But the situation did get me to start thinking on how to properly analyze a small multifamily house.I've only invested in SFRs so I'm a little green when it comes to properly analyzing a duplex.

Wealthy 2nd homeowners looking for someone to manage their home 11 months out of the year will gladly pay higher fees if you can demonstrate you’ll properly take care of their home and perform well.

From personal experience- electric can be very easy, because if wired properly, all circuits should be separate already and connect to one breaker box.

I'm looking mostly for if I buy a 4-unit quadplex (example, or Triplex), how to calculate NOI, Monthly Cash Flow, Rehab, Cap Rate, Cash-on-Cash, etc.For example, whenever I find a property on Crexi, Loopnet, MLS, etc. the NOI sounds good but when you factor in mortgage to get the cash flow, it's almost always negative.I also don't know how to properly calculate a rehab to see ARV so that may be the other issue.

OR you can make money when you buy with properly structured financing.

To properly renew a lease with a tenant, several tasks SHOULD be done:1) Evaluate the property to make sure tenant is taking care of it and you want them to stay.2) Do a market analysis of rental rates.3) Determine target rental increase amount4) We present all this to the tenant, as we assume they're looking at rental rates on Zillow, etc.5) We then ask the tenant what adjustment they think is fair and then negotiate rent amount and lease term (we always try to go for 2 years).6) New lease sent electronically to sign.All of this takes time, hence a Renewal Fee.

It's essential to consider and appreciate the diversity of housing options available, each serving different needs and lifestyles.

always best to satisfy the county what they're asking and for it to be done properly and septic can be a bad problem for the future 

But you are effectively putting yourself into more debtThere is good debt, and bad debtStudent loans are IMO bad debt - yes you get a degree that gives you a good paying job, but it costs you money every month to hold that debtReal Estate debt if used properly can be good debt.

Make sure the math checks out and your lifestyle energy works with the math.