Even if you self manage your underwriting should include this as it is effort and takes time.My thought on the ADU is before you proceed be sure that you understand the value that will be added by the ADU.  

My current rent is $2300 at my apartment and I'm assuming the $2300-$2500 liability will be consistent in this property given the Purchase price, interest rate, and including rental income of $2000-$2200 of the other unit.

That is still a 17.5% return(capex not included).  

.- Use cost segregation studies to expedite depreciation of your properties to offset large income gains.Entity Structure- Choose appropriate legal structure (LLC, partnership, or S corporation) with consideration for different tax implications.Tax Credits- Explore available credits, like energy-efficient or historic rehabilitation credits.Qualified Business Income (QBI) Deduction- Check eligibility for QBI deduction, providing up to a 20% deduction on qualified business income.Record Keeping- Keep accurate and organized records for tax compliance and audits.State and Local Taxes- Consider varying state and local tax implications, including property and income tax rates.Tax Planning- Engage in proactive tax planning, consulting with professionals for a comprehensive strategy.Tax Changes- Stay informed about changes in federal, state, and local tax laws affecting real estate investments.Remember to consult a real estate tax professional for personalized advice based on your specific situation.

I've included an example below to help illustrate this.So different lenders have different rates (which do vary even for DSCR loans) but these are factors they all consider.See example below:DSCR < 1Principal + Interest = $1,700Taxes = $350, Insurance = $100, Association Dues = $50Total PITIA = $2200Rent = $2000DSCR = Rent/PITIA = 2000/2200 = 0.91Since the DSCR is 0.91, we know the expenses are greater than the income of the property.DSCR >1Principal + Interest = $1,500Taxes = $250, Insurance = $100, Association Dues = $25Total PITIA = $1875 Rent = $2300DSCR = Rent/PITIA = 2300/1875 = 1.23DSCR lenders generally let you vest either individually or as an LLC.

This includes the C/O refinance once you complete the rehab.

An example is deeding a property valued at $100k from your name to your LLC or vise versa, you're now writing a check for $4,278.00 just to cover the tax payment to record the new deed, not including the recording fee and any fees collected by the title company or attorney representative who facilitates the transfer. 

Books I am reading currently include "One Thing" (re-read but for sure top 5 book of all time) and the "The 7-day weekend" which is a contrarian way of thinking about business. 

I spend MAYBE 2 hours a month including 1 hour on bookkeeping.

Hi BP,A deal that I'm currently working on has the potential of involving 2 separate partners, not including myself.