If you cancel it after a week, no refund.You selling costs seem low. 7% is barely more than the RE commissions.

No sense in putting another home on the rmls if you can't even afford the commissions.

Or do you sell at the top of the cycle and then move into a different asset class or focus on transactions (flips, commissions, etc)?

Quote from @Jon Taylor: 3.5 - 5 after all the commission and expense :)

I’ve seen the “reserves” category balloon to over 25% of the raise if the business model includes major value-add tenant improvement opportunities.3) Broker related commissions.

Second you must use all of the net proceeds from your sale in the purchase or purchases.Your net sale will be the sales price of $660K minus any closing costs or commissions. 

Out of which 5 to 7% paid to broker-dealer as commission. 

Take what you sell for net (after closing costs) say $360k in your case ($20k in commissions and closing costs of only 5%) and you paid let’s say only $160k, making a killing on your investment.

His awesomeness to drive the "understanding" of 1031 intricacies is super helpful, rather than folks that are coming here and there chasing quick commission we have someone like Dave that really helps investor in great detail.

The commission on DSTs are almost always the same as a regular real estate deal.