Al-Itikaaf- Is i’tikaaf in musallas and Islamic centres valid?

Is it permissible to observe i'tikaaf in musallas or Islamic centres
(in which the five daily prayers and Jumu'ahprayer are offered), or is
itpermissible only in masjids? May Allaah reward you with good.
Praise be to Allaah.
It is only valid to observe i'tikaaf in masjids, becauseAllaah says
(interpretationof the meaning): "And do not have sexual relations with
them (your wives) while you are in I'tikaaf (i.e. confining oneself in
a mosque for prayers and invocations leaving the worldly activities)
in the mosques" [al-Baqarah 2:187].
Al-Haafiz Ibn Hajar (may Allaah have mercy on him) said:
The evidence in this verse indicates that if it (i'tikaaf)were valid
in places other than the mosque, the prohibition on intimacy with
one's wife would notbe singled out for prohibition there because
intercourse is contrary to i'tikaaf according to scholarly consensus.
So it is known, from mention of the mosques, that whatis meant is that
i'tikaaf can only be in the mosques. Ibn al-Mundhir narrated that
there was scholarly consensus that what is meant by "sexual relations"
in this verse is intercourse. Al-Tabari and others narrated via
Qataadah that the reason for revelation of this versewas that if they
were in i'tikaaf, and a man went for some need and met his wife, he
had intercourse with her if he wanted, so this verse was revealed. End
quote.
Ibn Qudaamah (may Allaah have mercy on him) said in al-Mughni (3/65):
I'tikaaf is not permissible except in a mosque in which prayers in
congregation are held.
I'tikaaf is not valid anywhere except in a mosque if the person
observing i'tikaaf is a man. We do not know of any difference of
opinion among the scholars concerning this. The basic principle
concerning that is the words of Allaah (interpretation of the
meaning): "And do not have sexual relations withthem (your wives)
while you are in I'tikaaf (i.e. confining oneself in a mosque for
prayers and invocations leaving the worldly activities) in the
mosques" [al-Baqarah 2:187]. End quote.
Al-Nawawi said in al-Majmoo' (6/505):
I'tikaaf on the part of a man or of a woman is notvalid anywhere
except in the mosque. It is not validin the prayer-place of a woman's
house or the prayer-place of a man's house, which is a separatearea
set aside for prayer. End quote.
Shaykh Ibn 'Uthaymeen (may Allaah have mercy on him) said:
Shar'i i'tikaaf must be in the mosques, because Allaah says
(interpretationof the meaning): (interpretation of the meaning): "…
while you are in I'tikaaf (i.e. confining oneself in a mosque for
prayers and invocations leaving the worldly activities) in the
mosques" [al-Baqarah 2:187].
End quote from Fataawa Noor 'ala al-Darb (8/176)
See also the answer to question no. 48985
Based on this, i'tikaaf in musallas or Islamic centres is not valid.
And Allaah knows best.