In addition buying an existing ADU has the following advantages over building one 1) typically pay less for the ADU than the cost of doing a hands off ADU addition 2) get RE purchase financing which is superior to financing that is specific to the ADU addition.  3) there is no delay between financial outlay and income when purchasing an existing ADU.  

Apologies for the delay in responding.

It feels like you are trying to skip steps rather than doing the hard work of delaying gratification, thinking long term, and slowly building wealth.

I have a rental condo in Denver that I need to do either a cashout refi or some kind of delayed financing on.

The goal would be to have this cover or at least minimize the negative cash flow.

Other places a landlord who enforces a late fee for a few days delay will get concrete down the toilet and tenants who leave chaos behind in revenge.

Eric is correct on the minimal cost with above average durability.

Furthermore, delaying decisions may prevent both parties from pursuing new opportunities aligned with their respective goals.Evaluate your long-term financial objectives and personal aspirations for the portfolio.

Assuming that I left the whole area open like a beach house, the impact is VERY minimal, but has to be checked. 

I think drumming up interest is a good idea but if renovations are delayed or you run into any problems after purchase it may be more headache than it was worth or you may waste a prospective tenant's time.