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Cafe Milan - Tawa Pulao. Puri Bhaji while you taking a quick xerox of the Affidavit to be served on the other side;
Cafe Military - Kangaroo Beer, Pallonji, kheema pao, mutton cutlet, salli boti, typical irani fare,
Yazadani Bakery - Bun and Brun Maska, Khari and their Irani chai.
Jimmy Boy - Opp. CB for their burgers and Dhansak(essentially Parsi food).
Ripon Club - Exclusive Parsi gentleman's club. If you can sneak in through with a Parsi.
the ubiquitous Udupi Restaurants are hard to miss - Dwarka, Poornima( for the lunch south Indian thali) etc.
Starbucks at Horniman Circle for the Free WIFI and urgent client meetings- nobody will bat an eyelid if you conduct your conference by not ordering their overpriced,overrated coffee and just walk out after the 'deed'.
Fountain Sizzlers- Opposite HC if you have a fairly fat wallet and are in the mood to splurge. Their Sizzlers, Caesar Salad and other continental fare et al.
Hotel Fountain - For their scrumptious Manglorean Food
Cafe Brittania, Ballard Estate for their Excellent Chicken/Mutton Berry Pulao albeit expensive - Lawyers at JSA, DRT/DRAT and the erstwhile CLB can relate to this.

In a nutshell, you have fare for your wallet as well as palate. Bumping into a Kala coat is guaranteed at this places.

There's more including the quintessential drinking holes for lawyers, but it seems the OP's question was limited to food. Can add on public demand.
All good options. Jimmy Bhoy is a tad bit on the expensive side and I'm not sure why Starbucks is in this distinguished line-up. Kalaghoda Cafe is much better and at the same price point. The gomantak restaurants can also be included if you're looking for sea good (Mahesh Lunch Home and the others).

A special mention must be made for Deluxe; while not in Kalaghoda, they deliver to Kalaghoda and they are both cheap and delicious (if a little unhygienic).

If OP cannot find a reasonably priced good food option in Fort then OP will not be able to find a decent place to eat in Mumbai. Fort is literally the simplest place to find good cheap food - there is one place literally stone's throw away.

When I moved offices from Fort, the eateries were one of the (among many) disappointments of Lower Parel.