If you make personal purchases with the business account you run the risk of losing the insulation that a business entity provides. 

You should really tackle this debt before you get deeper into real estate, because if we hit a recession, which we probably will in a year or two, and a few things go wrong like you lose a tenant or two due to job loss, and your property values tank 20-30% ... you'll basically be on the verge of bankruptcy.

There seems to be promise from a multitude of leads and then people lose interest with the properties.

You’re the one that loses, not them.

My tenant is awesome and I’d hate to lose him, but I keep receiving notices from the condo board stating the dog in my unit is not allowed and must be removed.

You do lose some control of all of this.  

Also, you will lose any homestead exemption tax advantage and your 121 gain exemption when/if you sell later as an owner occupied. 

Otherwise they would lose the PM fees and the commissions on future purchases and sales.

My question is, where is the best place to save/invest my money in for the next 3 years that have a low to no risk on losing money and will allow me to gain interest.

As a general contractor myself I would say screw that contractor and he can lose out on the money because hes the one that went over and couldn't control his own budget.