The house of prayer, which is the temple of God that was built by Solomon in Jerusalem, is no longer a house of prayer because it has been destroyed, as seen in this teaching by Bro Eli.
https://youtu.be/fNkl0FoMtaY?si=00onAxgz9SQACKNb
According to this lesson, we can see that before the destruction of the temple, God warned His people about what would happen by revealing it to His prophets. Even His son, Jesus Christ, told His disciples about it.
Jesus told His disciples in advance that the house of prayer would be totally destroyed, this prophecy came to pass in 70AD when the Romans army destroyed Jerusalem and the temple which is the house of prayer.
The Arch of Titus which was built in 82AD is a memorial that shows that Jerusalem totally destroyed and this was also prophesied by the prophet Jeremiah and the prophet Daniel (Daniel 9:2).
Matthew 24:2 states, 'And Jesus said unto them, See ye not all these things? Verily, I say unto you, There shall not be left here one stone upon another, that shall not be thrown down.'
This prophecy was fulfilled in 70 AD. Therefore physically, we do not have the house of prayer anymore, but we have the Wailing Wall, where the Jews go to pray.
An important lesson learned is that any word sent by God will be fulfilled, and the word of God is the sure prophecy; therefore, we should not joke with the word of God no matter how long it takes it will be fulfilled.