Ask HN: Is this a fair offer for a mobile dev position in Austin, TX?

What is the typical salary range of a senior mobile dev in the Austin, TX area? I was given an offer in the 105k-115k range (with other typical benefits). This is over a 15% base salary drop from my current position in the DC area which makes me a little leery even with the cost of living differences.

Any help would be really appreciated!