I believe there is a provision for multiple properties, but I am not an expert on this topic.

There is no clear test as to how many house flipping transactions you must engage in a given year in order to trigger the UBIT tax.

That's the Rule of 7 across multiple channels.  

It's not uncommon to see houses listed at a very high price and sold for even higher due to multiple offers.

I usually don't know where, though, unless doing a skip trace, and that usually provides multiple addresses and multiple possible phone numbers.

@Steve Babiak, You're right, in particular when multiple properties are put into one LLC.  

Based on research on the Inglewood market and comparable homes, I made an offer that was significantly higher above asking - but apparently they got multiple offers of above $300K (asking was $224k), and my offer was declined.

The doc's keep fighting with insurance companies with multiple submittals to get paid.

If it's a good deal, the house will garner multiple offers on the first day it hits the market.

Multiple investors on the deedThere must be some smart way for multiple investors with varying resources and skill sets to come together in a equitable and profitable manner.