Nell and Kirby are in the process of negotiating their divorce agreement, to be finalized in $2023.$ What should be the tax consequences to Nell and Kirby if the following, considered individually, became part of the agreement?

a$.$ In consideration for her one$-$half interest in their personal residence, Kirby will transfer to Nell stock with a value of $$200,000$ and $$50,000$ of cash. Kirby's cost of the stock was $$150,000,$ and the value of the personal residence is $$500,000.$ They purchased the residence three years ago for $$300,000.$

The transfer of is a nontaxable event.

Nell's basis for the stock is $

Kirby's basis in the house is :

b$.$ Nell will receive $$1,000$ per month for $120$ months. If she dies before receiving all $120$ payments, the remaining payments will be made to her estate.

$,$ the payments are neither included in Nell's gross income nor deductible by Kirby since they are pursuant to a divorce agreement reached after $2018.$