My total cost is 40k, can resell at around $130.

Assuming your property is in Utah (like your profile indicates), here's the state law from a basic internet search:In Utah, a tenant who abandons a rental property without notice is liable for the lesser of the following: The rent remaining on the leaseThe rent plus the difference between the fair rental value and the agreed-upon rentThe cost to restore the property to its original conditionThe landlord can also remove the tenant's belongings and sell them if the tenant doesn't claim them within a reasonable time.

All that being said, it might not be worth the cost of putting in parking, just be aware on the front end that you’re reducing your end buyer/rental pool by not having it. 

Hi Robert, I always look at the rehab and deciding what I can do vs the opportunity cost of spending my time elsewhere.

So I would caution everyone to make sure the replacement cost for your improvements will realistically cover your actual replacement cost in the event of a total loss.

This gets you in the game with minimal upfront costs.Covering the Smaller Costs (Inspections, Appraisals, Earnest Money, etc.)Even when using other people’s money, you’ll need some cash for earnest money deposits, inspections, and carrying costs.

I paid about $1500 in closing costs between title, appraisal, etc, but the original loan was wiped out in favor of a new lower rate. 

Also, you didnt mention any financing costs, was this built with cash or do you roll that into your cost of construction?

. - I've had multiple vacancies, including one where the tenant left after a year and cost me $6k in turn costs.

It has been a very bad and costly experience.