Just kind of in the brainstorming phase.

Please remember, this is in the idea phase at the moment and details, such as a business plan, etc , are not in play at the moment. 

The Riverfront has gone through a few development phases and of course BPG owns most of the condo buildings down there as well.

@David PereiraGood questions, that depends on your goals, strategy to achieve said goals and risk tolerance.Personally, in the build phase of my strategy, I like leverage as long as it provides some cash flow.I also have to be mindful of the partners I have brought on, some like a lot of cash flow and others don't care as much.

To find out at the permitting phase that something is not allowed could be real bad to your expectations.If in doubt, maybe at time you are acquiring (during due diligence) pay a consultant to verify your assumptions with regard to ADU and JADU thoughts. 

That's a huge savings, and I'm in the acquisition phase of my portfolio, so I will do whatever it takes to get more properties here.  

There was a phase where I became overly focused on the day-to-day operations, neglecting to connect with new people or maintain existing connections.

I live in Utah and have one in Florida among others.Yes it will be some work (mostly during the set-up phase), but once you get things going it's really very little for the returns it produces compared to giving away 20% of your gross to a PM, imo.

I'm going to break my response down into 2 recommendations, because there are 2 phases of estimating costs that require different "apps".- Quick Estimates/Rough Calculations - Detailed EstimatesQuick Estimates/Rough Calculations using the Human Brain/Calculator/NotepadWhen you are first evaluating a deal you need to be able to roughly estimate costs as quickly as possible to determine if the property is a good deal and if you should make an offer.As other's have suggested, the human brain is great at quickly making rough calculations. 

I'm personally in a similar phase where I'm ramping up to my first deal, and was trying to decide whether or not a house hack must be the first deal I make since I am BRRRR-focused and so will need to continue to make multiple purchases and need to preserve capital for that.