I’m not finding any reliable public notice (as of August 20, 2025) that confirms which Sthanakvasi sadhu or sadhviji are doing Chaturmas specifically in Colaba this year. Local Sanghs usually announce this on their notice boards or WhatsApp groups rather than on open websites.

Fastest way to confirm today:

• Call or visit the Shri Colaba Vagad Visa Oswal Jain Sangh office/Upashray in Colaba; they host Sthanakvasi activities for that area and can tell you exactly which gurubhagwant are in residence this Chaturmas. Address reference: Roman House, near Colaba Market, Colaba, Mumbai 400005. ( oocities.org )
• Also check nearby Sthanakvasi Upashray offices in South Mumbai (Kot/Chinchbunder/Chira Bazar) since traveling distances are small and groups sometimes stay within a few kilometers; these Sanghs can confirm if the Chaturmas is in Colaba or a nearby Upashray this season. ( oocities.org )

If you can share the guru’s name you’re looking for (e.g., a particular Acharya/Muni/Sadhviji), I can try to verify their 2025 Chaturmas thana and see whether it’s Colaba or another Mumbai Upashray. For now, I don’t want to guess and risk giving you a wrong name.