You could put in a range of numbers for purchase price and closing costs, renovation expenses, and expected returns and you could very quickly get a range of projected return on investments (although an excel spreadsheet could easily do this as well), but I'm sure as technology develops we will see even more sophistication in AI's ability to assist in deal analyzing.

And as investors we should know this, but always anticipate higher costs and longer waits.EXAMPLE Breakdown of Costs:Plan Purchase: $1,500Permitting Fees: $2,500-7,500Site Preparation (grading, utilities, foundation): $20,000–$30,000ADUs require separate utility connections for water, electricity, and sewer but you can tap into existing utilities at the primary houseIn Raleigh you CANNOT split lots fee simple, so setting up completely separate utilities would not allow you to section off the ADU as of nowYour ADU must be on a permanent foundation (no wheels, no ability to move the structure)Construction (labor and materials): $100,000–$150,000Low-grade: $150–$180/sq ft averageMid-grade: $180–$220/sq ft averageHigh-end: $220–$250/sq ft averageLandscaping/Finishing Touches: $5,000Total Estimated Cost: $125,000–$200,000You could easily spend $200k+ with super end high finishes, custom designs, complicated sitework, adding a second story or more sqft, etc.

In any case, you can easily calculate that.Looking at your objective of retiring in Costa Rica, you have two options:1.

I used to use the method for years as a Florida Private Banker for wealthier clients that were susceptible to law suits and could relatively easily pay off the line.

But in smart buying, if someone has enough cash to pay cash for a property, they could easily stash a good chunk of that away to cover downed months and still leverage to increase the overall returns on their portfolio.

All you need is a 5% cash-on-cash return, which you can find in most markets. 5% of 4.6M = $230kSo it sounds like you can easily hit your goal.

With Baselane, you can easily generate reports for tax time that are organized and ready to hand off to your CPA.

It can happen all too easily! 

Most owners who do it want to keep the option of having the building vacant when they eventually sell the place since vacant places sell much more easily then tenant-occupied ones if it's a rent controlled building.

If you have the extra cash you can buy more units or be able to handle expenses that crop up more easily.