In other words you receive a 30% tax credit on the solar system as well as a 30% tax credit at the least on the roof that is under the solar system (full roof 30% depends on the advice of your CPA).Couple that with the roof now becoming a producing asset and offsetting the utility bill instead of a liability and the increase in appraised home value assuming the solar system is not leased then going solar makes a lot of sense at the same time as replacing/repairing a roof.

I am now just about ready to purchase another multi and am having a hard time finding other low down-payment options to utilize. 

I'm able to put down exactly 20% in down payment for the new house purchase.Is it a better overall strategy to keep/rent out the condo which is expected to net me a yearly profit of about 11k after taxes and HOA common charges and simply take out a 520k a mortgage loan for the new house ? 

I have a granite countertops installation company and would like to utilize my trades in flipping.

I can only speak for myself...since i bought my first place with zero down using a usda loan...i acquired the property and put my friend/brother in it to help house hack....I'd recommend doing this first...let the property build equity...then utilize HELOC to get into the flip game.

And in Miami, which is fairly expensive, AirBnB hosts that undercut the hotels make it a lot harder for them to compete.2 - Residential areas that are near or within tourist areas end up being part time hotels and people living there have to deal with non-stop partying, noise, overcrowded common areas, and people who generally just don't respect the property or other tenants.

For common jobs they may have a fixed rate other wise they will charge by the hour. 

- What utilities are needed?

Your utility might have a program to offset the cost.Aerators and showerheads are a great investment.

@Kyle MarekThe only thing paying it down as you use it gets you is low utilization.