With franchise values skyrocketing in recent years, the NBA wants to expand team ownership to include a broader array of investors. The high price of a typical team has made it harder for current investors to unload their stakes, so the league is getting more flexible. The basketball association told managers last year that it could create an investment vehicle that would buy such minority shares. The coronavirus pandemic — and resulting blackout of live sports — also may have put pressure on some owners to sell stakes in teams.