Is it permissible to sell a building that is drawn up on a plan by a specialized engineer before its construction?

The questioner : I said, and is it permissible to sell a building on the map, and likewise sales that are described as being in the debt? Of course, I told him I did not know this, and the Shaykh told me he knew it. Selling a building on the map, then he explained it to me. He said to me, for example, a plan from a specific engineer comes, and a person says to him, for example, "By Allah, what do you think about buying this building? It is still on the map and has not yet become a reality." So, Shaykh, is selling on the map permissible?

The Shaykh : It is permissible, my brother, with narrow and precise conditions and a commitment to fulfilling them, and this is difficult. A short time ago, we were in this discussion with Abu Muhammad 'Asfour.

The questioner: Yes.

The Shaykh : So he asked me the same question, and I answered him with the same answer.

The questioner: Yes.

Another questioner : What is his name? Masrur asked you?

The Shaykh : It is not Masrur; it is Abu Muhammad 'Asfour.

The questioner: Yes.

Another questioner : I came to tell you 'Asfour, but I said Masrur.

The questioner : 'Asfour, yes.

The Shaykh : No, I said 'Asfour. The important thing is the ratio of the cement to the concrete, meaning...

The questioner : The iron.

The Shaykh : It is that everything should be clear, this is in terms of the conditions. Then, in terms of knowing the fulfillment of the conditions in a certain country or by a certain person. When I mentioned these conditions, I followed them up with a question to Abu Muhammad: "What do you think? Are these conditions applied?" He told me, "Generally, contractors are not willing to accept them, but we, praise be to Allah, are committed."

The questioner : What Allah willed.

The Shaykh : So, with these conditions, it is permissible.

The questioner: Perfect.