If you are doing a BRRRR the rehab for a rental you intend to hold might be different than a flip you intend to sell.

You need to make sure that your property is easily financeable if you decide to sell it in the future and any future buyer can call out non-permitted items and actually report you to the building department or, at a minimum, ask for seller concessions.

A good approach is to set aside an additional 5%–10% of gross rent for CapEx, depending on the property’s condition and renovation quality.While turnkey companies often provide attractive numbers, it’s important to remember their goal is to sell properties.

., selling a non-grouped rental property in a taxable sale to a non-related party, both current and suspended passive activity losses generated by that activity can be deducted. 

Or stay a second year and sell tax free. 

As a result when the brokerage acts as the listing and selling brokerage  it saves both home sellers and buyers money.

If the numbers make more sense on the 6 unit, then maybe look into selling your duplex and doing a 1031. 

Perhaps you want to sell ownership interest.

However, these costs can often be added to your property's basis, which helps reduce capital gains tax when you sell the home.Once the property is officially a short-term rental, subsequent repairs and maintenance would likely qualify as deductible expenses. 

So I would say that once she moves out we will probably sell our "forever home" and it will mean 10 years-ish is "forever" for us.