You'd have to engage a grading contractor who might be able to give you a ballpark estimate, but it would maybe have to be engineered with rough and precise grading plans to determine costs. 

The ones who bought in good areas and used my contacts for handyman/repairs do great with cashflow+appreciation but some bought in rougher areas who try using 3rd party managers and the expenses eat into profits even just turnover costs are way under-estimated by most investors add in lower quality tenants and that 10%+ cashflow deal turns into 0%.

Ask your property manager for at least 2-3 estimates on anything over $1,000. 

Google CEO estimates that we will see their capabilities double every 12-18 months.

Just call him, all that you want to know in the questions above he can answer for you.He is incredibly nice, but nonsense, he is ex military (navy if I remember correctly).He is not a hard sell kind of guy, in his estimation you either want to invest or you don't so he is not going to chase or pester you.  

The Triple Net Component of the Lease is paid by each tenant on a monthly basis and is an estimate of what the total expenses will be on the property for the year.

My primary house estimate value is around $450k, I still owe $60k for mortgage, and I have $45k in high yields saving now. 

For perspective, the house directly next to this house is estimated at over $900k fully updated with slightly higher square footage, but 1 less bedroom.

There are drawbacks however, and it certainly isn't cash as multiple draws, estimates, and appraisals are required throughout every step of the process. 

Never, Never use your sellers property tax expenses to estimate your future property tax, this is a big mistake done my many people in the industry.If you haven’t sell your Main home where you are living yet you might consider to keep it, because your new home would be triple the amount your are paying right now.