They are a bit undersized but perfectly suitable for 1 bedroom apartments and the slight increase in costs is far less than the costs associated with venting the units properly.

Also your permitting process, type or land, grade of land, if underpinning is required will all play a factor into your cost. 

@Yooni Choi managing from out of state (OOS) with ZERO previous landlord experience - probably won't go well.You WILL make a lot of mistakes that will cost you money.

A good real estate accountant can save you thousands of dollars by leveraging entity selection and formation, tax deductions, cost segregations, bonus depreciation and tax planning.I recommend finding an accountant specializing in real estate taxation, business taxation, financial planning and tax planning.Consider working with your accountant remotely to expand your options.I would also recommend looking for an accountant willing to work with you throughout the year.

If there’s a significant difference, it might justify the cost of adding more beds.For example, we manage a 4BD property where one bedroom is currently locked off, so it only sleeps 6 (1 king, 2 queen).

Can try to reposition to Class B, but neighborhood may impede these efforts.Vacancy Est: Historically 10%, but 15-20% should be used to also cover tenant nonpayment, eviction costs & damages.Tenant Pool: majority will have FICO scores of 560-620 (approaching 22% probability of default), many blemishes, but should have no evictions in last 2 years.

If a large repair or tax/insurance hike were to happen with a multi-unit than you at least have other units cash flowing (usually) which helps stabilize such unexpected costs. 

If I invested 100K today, they are currently providing anywhere from 60 to 72% passive tax deductions due to cost segregation, depreciation, etc. 

Given the latter costs, a corporation can be the best solution only if you buy multiple properties.

Would you rather set it and forget it and not need to refi again or rather take advantage of low/no closing costs on this loan and plan to be more aggressive on your rate at the time of your refi?