Q: "is there any option I can avoid that tax as it was bought as a primary residence."  

A:  Sorry, no.  The wording of the law is that the property must have been "owned and used as the taxpayer's principal residence", in order to qualify for the capital gains exclusion.

https://www.law.cornell.edu/uscode/text/26/121

@chutki0700 since you rented out the house, did you take the depreciation? if no, suggest getting your taxes done locally (in CA) once you sell - the recapture tax is going to be a mess if you didn't take the depreciation.  

What you really had (until you rented it out) was a 2nd home.......there is no capital gains exclusion on that.  The IRS requires you to live in that primary residence for 2 of the past 5 years to take advantage of the capital gains exclusion.  

Look at the bright side: you probably are going to have a gain on the sale. if so, you made money!

Appreciate 

Q. how much capital gain tax do I owe?

A.  For an estimate, Try this tool https://turbotax.intuit.com/tax-tools/calculators/taxcaster/?s=1. Enter your regular income first to see the regular tax. Then add the sale to see the effect.
Enter the difference between the sale price and what you paid for it originally as a long term capital gain (LTCG). Enter the depreciation you've taken over the years (depreciation "recapture") as other income. Depending on how much total income you have LTCG are partially taxed at 0%, 15%, 20% and/or 23.8%. Depreciation recapture is taxed at your marginal rate, but not more than 25% (the Taxcaster tool is not capable of applying the 25% cap).