Texas property tax question

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Hi all, 

I am a newbie here working on 2.3m deal in Houston. The listing is completely off market and seller financing. 

The current property appraised value is 1.1 m and I am buying it for 2m because of great cash flow. Last year tax is about 30k. 

My questions is after the transaction, would my county tax appraised value change to 2m and my tax would be like 45k?