The slew of new hotel rooms proposed for greater downtown Detroit last week is another positive sign for a rebounding hospitality and tourism industry in a city that was bankrupt just five years ago and whose hotel rooms were less than 50 percent occupied on any given night a decade ago.

But the fact that the 536 rooms are in three separate buildings serves as another reminder that the city has not gotten one thing that experts say is needed: a large-scale hotel that will help lure big conventions and major sporting events.

Among the reasons for that: enormous cost and relatively few available places that make geographic sense to build one, said Michael O'Callaghan, executive vice president and COO of the Detroit Metro Convention & Visitors Bureau. And because convention goers generally like to be near their events, that's putting the city at a disadvantage.

In less than 24 hours last week, new details were revealed about one project totaling 154 rooms and two more totaling 382 rooms.

First, the planned $50 million West Elm hotel unveiled its anticipated scale — 12 floors with 154 rooms — on Woodward Avenue and sealed a deal with Wayne State University for a long-term lease of the Bonstelle Theatre to the south, with plans to renovate and restore the 1903 building that is the former Temple Beth El. The internal working title of the project is the Hotel Bonstelle by West Elm, the Brooklyn-based furniture retailer.

Then on Thursday by noon, a pair of new luxury hotels were announced. First, the 154-room Cambria Hotel at 600 W. Lafayette Blvd. is slated to rise on a vacant parking lot owned by a joint venture between Detroit-based developers Eric Means and Brian Holdwick, himself a former Detroit Economic Growth Corp. executive.

Three hours later, it was revealed that a 228-room luxury boutique hotel — which sources said is a Thompson Hotel — is planned to rise across 16 stories of a 25-story high-rise planned to anchor a $310 million development on a vacant 3.78-acre parcel owned by Ciena Healthcare CEO Mohammad Qazi. Also planned on that site immediately north of the Midtown Whole Foods Inc. store is a 30-story residential high-rise with about 250 apartments and another 12-story building with a few hundred co-living units. The project, which its representatives say is set to kick off in the summer with a ground-breaking ceremony, would also include public space, about 750 parking spaces and up to 100,000 square feet of retail.