Condo project often requires pre-construction release phase. They require pre-construction sales to get the construction loan approval from banks. In pre-const phase, they can let you lock in a price that's about 20% below market price. By the time pre-const phase is over, you flip it to new buyers, you are guaranteed for at least 20% profit. It could a lot more depending on how hot the market at that time.
Usually, builders need to organize pre-construction sales to get their units at least 20% sold on paper. For example, a 300 units condo project should have at least 60 people signed up. Then bank will look at this and approve the builder for construction loan. This is a required process for most builders. Builders love pre-construction flippers like your parents see you come home..., builders love you. But you do need to know the information when this builder start to pre-construction release. Timing and information is important.
Even today, in places like Chicago, there are couple of projects offering pre-construction sales, but since the market is bad, it makes no sense to join. You better spend time finding builder auction sales or simply hard-negotiate with builders on quick delivery houses, you often get 20-30% discount that way.
No, today is not a good time to flip at all. Today is a good time to learn the skill for future use.
回答: How can we get those informations about pre-construction release
You can do it in 3-4 years. Get hook up with these builders. When time is hot, it's not hard to know these information. You previously didn't pay attention because you didn't have the knowledge of pre-construction business. Now you know. I am sure you will find them when time is good again. Clues, find them on Florida shores, DC metro, Las Vegas, San Diego, all those old hot places. I will guarantee you that they will get hot again in 4-5 years, or sooner.
or join a join a pre-construction club.
search "Pre-construction club" in google, you will find them