But it would seem appropriate that a gross sale of $1 mil with the components of $700K actual sale and $300K gift, would still require a reinvestment of $1 mil since the gift is made of value to avoid taxation to the recipient so the gain should stay with the donor.

Short-term rentals might fall under Loudoun's new laws about AirBNB-type rentals, which at this time require only registration (taxation and permits likely to come in the future).

So if you decided to sell one or more of the properties down the road, you could do so through another 1031 and continue to defer taxation.

The agreement can be whatever you want, just like an online advice :) However, for taxation purposes, this idea of @Carl Fischer will not work without modification.

One way or another you are going to pay for your "tuition" - either a. being scammed by gurus hoping they will teach you the "secrets" on how to become a millionaire in your first year/month/property/flip/deal, or b. while doing mistakes in your first projects/deals (but at least you get something out of it and is the best form of education)  or c. putting a lot of time, effort and resources in learning about real estate investing industry (and that includes marketing, financing, negotiation, contracting/legal, taxation, hiring, project/people/property management, etc.).

Hint, Tree service companies(timber states), every property manager you can find, every real estate agent you can find, any mortgage broker in the desired zip code, county taxation dept loves free pizza Fridays.

Anythings possible but as more states favor taxation the feds anti efforts seem less likely each day. 

Saw this over at MMM and thought this would be of interest to any live-in flippers expecting to have their capital gains shielded from taxation when they sell...It seems the House tax plan would redefine "principal residence" as a place one has lived in for 5 of the past 8 years rather than 2 of the past 5:SEC. 1402.

Below is a publication the IRS put out to understand the taxation of rental property.https://www.irs.gov/pub/irs-pdf/p527.pdfThe IRS describes that charging a family member rent that is below market rent is considered a personal day.

(specials was $18,534) the only conclusion i can come up with is that it is  35% taxation of that 50,000 annual rental income?