Would building two houses simultaneously possibly affect price?

[Christopher Pearson]

I have a property in Farmingdale, NY that has been subdivided. I am planning on demo existing house and building two new houses next to each other. I am considering building both houses simultaneously to lower building cost. 

New construction sales price in this area is around 800K and I've seen current market for new construction has been a little over 6 months.

I have been told that two new houses built at the same time will possible affect the sales price and people perceive two houses built the chances of selling quickly are more likely. Do you have any input or advice regarding building one house at the time or building both houses simultaneously? I will be using hard money for construction. My concerns are: I would have a larger note and if they don't sale right away I will have to be covering the high interest. 

Thank you for your advice.