Cost of value add was $120k, so over $580k of increase above costs.  

It is amazing how many times I have seen the cash flow represented as rent - PITI and to compound the issue they did not realize the ADU would increase their property tax.   

I would want to make improvements to all units and increase the rent to market value when the renovations are completed.

My spreadsheet also includes FMV of every property so I can monitor appreciation, year over year comparison of tax & insurance increases, current rent & last increase & last amount, etc.

An experienced property manager should minimize vacancy, increase income, and have connections with contractors and other professionals to manage your property well to maximize your return on investment.To Your Success!

Can you PROVE that the landscaping increases rents of ability to rent? 

By accelerating your depreciation schedules, you reduce your taxable income which in turn increases your operating cash flow.

Is it best to simply increase rent by a fixed amount (e.g., $700) to cover this, or are there other strategies for handling utilities in this situation?

You can always just increase the liability on your current carrier.

A coach makes sense if you are 23 and want to increase your skills enough to earn a living with the sport.