Sure," were" is the right answer

بعد تحليل الموجهين الاوائل والمستشارين وسؤال اساتذة الجامعة if only

my regards to all those saying were

were ان شاء الله

الجملة الفعلية
If the flat which I had were large enough, I wouldn't sell it.
وهنا يمكن استبدال if بــ were وهى الاجابة الصحيحة

were is correct

were 100% as it is the second case

thanks a lot

were بدلا من if اكيد

wereالاجابة هى

The answer is were
" If the flat i had were large, i wouldn't sell it.
Were the flat i had large, i wouldn't sell it.

Answer : were