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* ‘planning to build opposite our residential area’ (The use of ‘opposite’ in this way is very common in Indian English. But, I suspect that this usage might be nonstandard. I would have written ‘that you are planning to build right across our…’ . Please look up ‘how to use ‘opposite’ for locations. I believe it is usually ‘opposite to’ rather than just ‘opposite’.
* ‘lead to an exponential increase in’
* ‘offer superior facilities for its home dwellers’ sounds a bit unnatural. I would have just used ‘residents’ or ‘owners’
* ‘in more details’ (in more detail)
Score: 2.25/3 (Generally speaking, your letters have fewer errors compared to your Task 2 essays)