Using a family address could expose you to unnecessary risks in the event of any legal or financial issues related to the business.Additionally, these virtual offices often provide extra services like mail and package handling, telephone answering services, and access to meeting rooms, making them a more professional and practical solution.

Some companies might charge extra for maintenance coordination or inspections.

Despite the extra requirements we had plenty of showing and very little vacancy. 

Otherwise perhaps your winter people will pay $500 extra if your cap is $500 and that is not what your competitors will be doing. 

Chris would tell him I hadn’t sent the money when Chris actually had gotten money for the rehab at closing, plus extra that I sent for change orders (which had not been done).

For example, this can be adding square footage, adding an extra unit, or adding a pool in a STR market/luxury market.  

Is it worth to invest and learn from their program in order to start my co-hosing STR side business just to get some extra money monthly?

It 12 years, assuming you make no extra payments, you'll have a paid off condo that cash flows a lot better. 

Purchase price: $82,077 Cash invested: $50,000 Sale price: $275,000 Fix & Flip mobile home with extra lot.

It shows you are serious and willing to go the extra miles to make it work.