Barnard Marcus raised £19.7m with a success rate of 70% at its second auction of the year.
Of 199 lots offered, 139 were sold with 129 finding buyers in the room and 10 prior to the sale.
The firm’s first sale of the year raised £18.6m with the same success rate of 70%.
Divisional managing director Chris Glenn said: “Overall I am pleased with the sale, and there were one or two surprising results.
“From the sales I know that are already agreed, the result will rise dramatically, and I’m currently forecasting circa 80% final sales success rate,” he said.
“Of particular note were lots offered in provincial locations where London-based investors fought hard against local buyers that either attended the auction or bid remotely by phone. In fact, it was the bidders in the room that won the majority of the lots,” Glenn said.
Among the lots selling were 18 flats in four blocks in Heywood, Lancashire, generating an annual income of £121,200 pa, which sold for £1.2m off a guide of just over £1m. A block of 18 flats in Eccles, Manchester, with an annual income of £68,000 and guide of £725,000, sold for £772,000.
A three-bedroom terraced house in Wembley, Middlesex requiring modernisation was guided at £300,000 and sold for £386,000.
Three lock-up garages and a store/workshop in Walthamstow, E17, offered with a guide of £50,000-plus by Waltham Forest Council, sold for £229,000 after 70 bids.
A former care home in Crawley, West Sussex, with a guide of £1.5m went unsold, with the last bid at £1.6m.
A thatched bungalow in Hook, Hampshire, was purchased for £219,000 from a guide price of £210,000.
The sale took place at the Grand Connaught Rooms, WC2, on 13 March.