If the insurance is higher, like in a flood zone, or hurricane zone the net will be lower. 

You can only play games for so long.Chances are your next door neighbor is an IRS agent and turns you in when your tenants blocks their drive or some other random event disturbing your IRS neighbor.ADU catches fire and your insurance won't cover you, because it was an illegal and unpermitted structure.The city inspector told the last guy not to build or rent it, and is now pissed and wants to make an example of you and just red tags the whole property and no one can occupy for the next 1-2-3 years while you wait for a hearing.Then when you get the hearing, "staff" recommends you tear the whole structure down, and if you still want an ADU, you can apply for a permit and rebuild it.Your tenant quits paying rent and won't move out and you can't evict them, because there is no valid lease and they're just your "roommate".Probably a dozen other bad things can happen to you when you do stuff like this. 

Deduct NEW property taxes after you buyDeduct home insurance costsDeduct maintenance percentage, typically 10%Deduct vacancy+tenant nonperformance percentage(we recommend 5% for Class A, 10% Class B, 20% Class C, good luck with Class D)Deduct whatever dollar/percentage of cashflow you wantNow, what you have left over is the amount for debt service.Enter it into a mortgage calculator, with current interest rate for an investment property, to determine your maximum mortgage amount.Divide the mortgage amount by either 75% or 80%, depending on the required down payment percentage - this is your tentative price to offer.If the property needs repairs, you'll want to deduct 110%-120% of the estimated repairs from this amount.Be sure to also research the ARV and make sure it's 10-20% higher than your tentative purchase price.As long as the ARV checks out, this is the purchase price to offer.It is probably significantly below the asking price.

Does anyone know of any good insurance brokers as well ?

The longer the maturity rate of the bond, the higher the yield is to compensate an investor for the additional risk they are taking on with a longer dated bond.Stocks that pay divideneds....insurance companies have a lower yield than telecom stocks as a reflection that telecoms are higher risk than insurance companies.In the efficient market hypothesis, if markets are efficient then the yields should be reflective of the risk.

I am interested in working for a REIT firm or a private investor who can show me the ropes of investing in residential, commercial, and/or multifamily real estate.

Your insurance company likely has a no smoking clause on your policy and will back you up as you suspect this.

You might be referring to income / expenses that are reflected by cash.Cash you receive from rentsExpenses that you pay out such as insurance, interest, taxes, etc.You may not have included depreciation expense which would bring your taxable income down further.It may be possible that the negative taxable income would bring your taxable income down.

If everyone in the chain is good at their job: Investor, Broker, Lender, Title, Insurance. 

And typically long term rentals don't make it easy to include property management fees into the numbers and have them still work well.I would consider looking into STR type areas where you can avoid the risk of property damages (str and pm insurance covers almost everything that they might damage) and evictions/collections.