She always told me that she wanted me to own this property but she passed away unexpectedly before she could make me a Will I know that is not any good proof.

They never told us they were charging and since we told them before move out we didn’t have the keys, it was unexpected.

I figure it is worth sharing so that this doesn't happen to any of you.So what was this unexpected expense?

See remaining balance.principal, interest, taxes, and insurance (PITI)The four components of a monthly mortgage payment on impounded loans.

If it was a larger scale job I would have gone for something that had a time component to it.

Management is impossible to select until you have picked and vetted a firm- while it is an operating expense, you're likely going to pay from GOI...so assume closer to 12% NOIYour vacancy is pretty low, but it's all relative here...I would at least set aside 1-2 months gross rent for an unexpected turnoverIf you can insure a 4-unit property for $150/mo. you have an awesome agentAssuming 50% of your income will go to OpEX is pointless.

The real property (structural components) doesn't qualify for bonus depreciation and would still have the 27.5 year for rental and 39 year for commercial property depreciation schedules.

If you have steep driveway and little to no backyard then many families will not like that at all.When you bought you might not have done enough analysis on other components of the land.

That doesn't give much wiggle room for unexpected expenses (or expenses that are more than your estimates). 

Roth IRAs cannot be transferred to Solo 401k plans.A few other Solo 401k benefits: Compared to an IRA, Solo 401k contributions limits are roughly ten times higher.There is no custodial requirement for the 401k.You don't need the additional expense and administration of an LLC to have checkbook control.There is a built in-Roth component whereas IRAs are either traditional or Roth, not both.A spouse can also participate in the same Solo 401k plan.The Solo 401k has additional tax benefits over an IRA when investing into real estate using leverage.