These updates modernized the property, improved its curb appeal, and significantly increased its market value.

Since so much of the return was frontloaded in the first two years, IRR will not improve by holding onto the properties.The only way to tap into equity is to refinance or sell the property.

Do you plan on making a documented improvements to the property?

The wifi is what will allow you to access the door remotely.If you don't want wifi on it, Then you can still get a smart lock you'll just need to pre-program several different codes into it, and then give out those codes appropriately but you'd need to be on site at the door itself to program initially or update it.From personal experience I find the touch screen or wifi locks to be complete POS's that are not reliable and the battery does not last long.  

I would be very careful buying in C areas and hoping for improvement. 

Your basis in the property is purchase price plus improvements.

As mortgage rates eventually drop, your cash flow should improve over the long term.

. - If you're doing new cabinets and countertops, look at what other comps rent for and what other improvements you could do to help raise the rent.

So if your goal is to appraise for more, which is the goal of the BRRRR method, it would probably be best to invest that money into things that will cause it to appraise for more such as improving the house itself to be more aligned with the comps in the area.

Nothing has changed about my property - I made no improvements - that caused it to increase 20% in value in 1 year!