As the great and the good of the New York art world gather for Frieze – the city’s most important art fair – there’s a new kid on the block: the Alternative art fair Esther, opening today (1 May). Running concurrently to the Frieze frenzy, Esther invites collectors, dealers and art lovers to experience the architecture and history of the East Side’s Estonian House. The choice of this elegant four-story Beaux Arts building, which has long served as an important gathering place for New York’s Estonian community, is no coincidence, with Esther’s founders hailing from Estonia. Its founders are two…