If the intent was truly investment property, then form 4797.

Form 8949 It is capital gain

OP was stating that the property was business property and not personal property. OP will have to do so leg work to show intent of purpose for the property.

Although, since short term the results will be the same unless taxpayer has other business gains or losses.

The devil is in the details, so let's just go with schedule D since it is a shorter answer than 4797 or 8949.

Have to agree with @IRonMaN use the KISS system

It is reported on a 1099-S, still start with the 8949?

The consensus is, use the schedule D worksheet then everything will flow where it should. You start with the worksheet and not the 8949.

I agree, go with the schedule D