This one is a big improvement because we'll gain a lot of space, a more "house-like" layout, and a garage, and a third bedroom!

The improvements needed to be completed within the 180 day timeline, so I did a pre-fab ADU.

Improving grading or having downspouts drain into pipes that move the water away from the house often solve the majority of issues. 

It takes a lot of practice and sucks in the beginning, but if you stick with it long enough and keep improving it will be worth it

After the improvements, the property was staged and marketed to retail buyers.

kitchen update, driveway improvement What was the outcome?

I own a home improvement company and also completed a flip with great ROI.

I have looked into the windows and currently have a contractor quoting it out, however it is extremely expensive and there are no promises that it will improve the noise.

Quote from @Andrew Steffens: I would follow the advice above to see if you can improve seated comfort but short of that I would not go and replace, at least not yet.  4 stars is good and it seems you will get more 5 stars based on 2 previous to bring it up. 

Hoping that cash flow will improve substantially as this is going to be a big part of my retirement.