There will be some customary fees that hit seller side, but this is may vary state by state.On both buy and sell, you will have things like wire fees, maybe underwriting fee, etc, but these tend to be minimal.Holding costs: HOA, if you have one.  

I'm now selling that house where I was house hacking and Airbnb for the last 10 years.  

That's not enough information for anyone to give you any relevant advice.Does your neighbor want to sell?

The typical clients that seek out cost segregation studies include:Real estate companies that buy and sell multiple properties each year.Individuals with a portfolio containing investment properties including apartment buildings, multi-family homes and even single residences.Franchise owners with properties that are similar to one another such as assisted living facilities, storage facilities and golf courses.Business owners of hotels, food facilities, shopping centers, restaurants or manufacturing plants.It depends on the type of property, but generally 15-45% of the building’s costs can be classified into assets with a shorter life.

Hoping to sell the house for 300k.

Owner was desperate to sell. 

Your cashflow will be much higher than other markets, but you'll sell the property for what you bought it for seven years from now.

I know the market well as I sell a lot of duplexes and small apartment buildings in the area.What was the outcome?

If you have thought about selling, let's talk.

I would like to pass on a little bit of useful information for anybody thinking of converting their permit over to owner-builder. 1 - You will not be able to sell the property for a minimum of 365 days from the date of issuing of the CO. 2 - The property must be for the owner's own use and occupancy and not for sale or lease which means you will not be able to rent it out. 3 - The owner-builder must ensure that all employees working on the project have the required licenses.4 - The owner-builder must provide worker's compensation as required by Florida law.5 - To apply for the owner builder permit, you must physical visit the building department.There are others requirements and conditions, however these are the main items.