For more info, in making that determination, see a similar question at: https://ttlc.intuit.com/questions/3399983-tax-issues-regarding-flipping-of-a-house
And references at:
https://www.hrblock.com/tax-center/income/real-estate/flipping-houses-taxes/
https://fitsmallbusiness.com/taxes-on-flipping-houses/
