What system besides excel can be used to keep track of the metrics on how the property is actually performing after purchase (long-term basis).Thanks in advance for the suggestions 

That they can somehow calculate all the risk out of this.This is a newish part of how real estate gets passed off as a possible get-rich-quick system, too.

They just can't put out the needed cash for major systems upgrades. 

I have a great system that's why what I do is working.

A oil fired boiler , a water conditioning system , an oil fired hot water heater , a 4 zone mini split  system , 2 sump pumps , a refrigerator and the stove .

But when you mention narrow lot to me that suggest you are more north than south within the Bay Area and therefore demand and prices would be on the higher end of the scale.

I want to know if it’s  worth doing or I can just make downspouts face the concrete and direct water away from  towards a channel drain system already existing. 

On a side note: I'm a big fan of time blocking, productivity systems, and practice The ONE Thing methodology.My hubby is working towards getting his real estate license by end of year, and our plan was to work together as a husband-wife team in the short-term and long-term.Most of the advice I've received from my broker and other seasoned agents is that I need to consider going full-time, or I'm at risk of washing out or not reaching my income goals.

Bottom line: I get the system and how things actually work.

So if I start with a duplex or a quad as my first property my goal would be to have a net cash flow of $500I intend to use the "BRRRR" (Buy, Rehab, Rent, Refinance, Repeat) method but have never used this strategy before so I still have a lot to learn If I only close on two deals starting in 2019 then I will need to find another 20 deals in the remaining four years (2020-2024) that also meet this criteriaBeyond 2024 I plan to continue to scale even more over the next 3-5 years with an end goal of financial independence by ~2030 (meaning that I will not work a "day job" but will passively manage my real estate portfolio)Biggest hurdle: I'm going to be living outside of the US for the next 3 years and will (likely) not be able to physically see any properties that I plan to purchase.