You may sell any kind of real estate held for productive use in business trade or investment and purchase any other kind of real estate to be held for productive use in business trade or investment.Residential rentals exchanged for real estate used to house and conduct your business would qualify.

They may not buy, you may not earn a cent from them, but you get experience and can learn the tools of your trade.  

I have basically lived here all my life, I have been in the plumbing trade for over twenty years and if any one has a question about plumbing I will be happy to help, just give me a couple of days to reply.

Separate the trades, demo contractors are faster with demolition work and framing contractor is faster framing them.

I am a carpenter by trade so I have background in that if that makes any difference.

He is a RE lawyer by trade.

They may not buy, you may not earn a cent from them, but you get experience and can learn the tools of your trade.

Many building departments require architectural drawings, insurance bonds, licensed trades and inspection fees.

My utilities also averaged <$100 per month over the same time since I face the cold trade winds side.

If you just want to go by historical numbers I believe the luxury end of the market is going up faster probably in part due to forign demand and income appreciation by those already well off as well as people trading in appreciated housing.If you want to know about living in NYC or RE here feel free to PM me.