I believe you can qualify as a real estate professional if you are a general contractor and meet the hour rules. But then you have to meet the material participation rules for the properties and this must be handle correctly. You may need to make the single activity election. You might want to review:
http://www.ustaxcourt.gov/InOpHistor...r6.TCM.WPD.pdf
You also may need to speak with a professional to be sure you get this handled correctly. The IRS has made a lot of money from people misunderstanding all the nuances related to real estate professionals and/or passive losses.