Many of the musicians & producers that Jimi worked with in New York City during 1964-1966 were in one way or another connected with the address 1650 Broadway (also 200 W. 51 St.). Jimi never mentioned the building in any interviews but he must have gotten a lot of work via people who worked there as 1650 Broadway housed several record labels, agencies and recording studios.
A brochure advertising the building describes it as "a prestige address in the entertainment world", a home for "major & outstanding music publishers" - the brochure is available here as part of the collection of Columbia University Libraries. It's undated but obviously old, possibly from the 1960s.
Below is a list of companies located at the address that have a known connection with Jimi. Much more information could still be added, this is a sort of "first draft". Any corrections or additions are thus welcome:
Booking Agencies
Queen Booking Corporation
Some or all of Little Richard`s 1964 / 1965 gigs were very likely booked by the Queen Booking Corporation run by Ruth Bowen and located at 1650 Broadway The evidence for this is a Little Richard promotional photo with the company`s address on it. That alone isn`t much proof but the photo used comes from a session pictures from which were used in all of the 1965 gig ads - which dates the promo photo right in the 1964 / 1965 period (instead of the incorrect "circa 1957" -credit Getty Images gives for it here).
Queen Booking Corporation
1650 Broadway, Suite 1410
New York, New York 10019
Phone: 265-3350
RECORDING STUDIOS
Studio "76"
Room #706, 1650 Broadway, New York City 5
Ed Chalpin's studio (where Curtis Knight & the Squires recorded between 1965-1967) and the offices of PPX Enterprises, Inc.. 1650 Broadway was an office building and was divided into various rooms / suites / units, Chalpin seems to have derived the name of the studio from the number of the room that he was occupying, #706.
In 1970 the name Studio "76" was changed to "Dimensional Sound. Inc." and the studio was moved to a new address at 245 West 55th Street.
Another Studio "76" (opened in 1965, operated at least until 1972 4) was located in Los Angeles - this may have been a sister company to Chalpin's Studio "76"?
Allegro Sound Studios
Curtis Knight (& the Squires) recorded at the studio for RSVP in 1966.
RECORD LABELS
RSVP
Curtis Knight (& the Squires) was contracted to RSVP and the company released three Curtis Knight singles (two of which feature Hendrix).
Bang
Bang was owned by Bert Russell aka Bert Berns who amongst other classic songs wrote or co-wrote "Twist & Shout" (recorded by the Isley Brothers, covered by the Beatles and Curtis Knight & the Squires) and "Hang On Sloopy" (recorded by the McCoys and covered by Curtis Knight and the Squires).
"I Can't Explain It" (the flipside of the McCoys 45 "Hang On Sloopy") was written by the songwriting team Bob Feldman, Jerry Goldstein and Richard Gottehrer. Jerry Goldstein later produced merchandise for the Jimi Hendrix Experience via a company called the Visual Thing. In 1969 Goldstein and Steve Gold made the infamous Jimi Hendrix Experience Royal Albert Hall 1969 concert film which remains unreleased to this day due to apparently eternally unsolvable legal problems. Jerry Goldstein was also a member of the "group" the Strangeloves who had a hit with "I Want Candy" (written by Bob Feldman, Jerry Goldstein, Richard Gottehrer and Bert Berns) released by Bang in 1965. Though it has never been discussed in any publication that I'm aware of it's quite possible that Hendrix knew Goldstein "from the old days". Note that it`s easy to mix Jerry Goldstein up with Michael Goldstein who also worked with Hendrix, as a publicist.
Billy LaMont also recorded for Bang.
Wand
The Isley Brothers (who Jimi played with) recorded for Wand in 1962-1963, Chuck Jackson (who Jimi toured with) recorded for Wand in 1961-1967, Maxine Brown (who Jimi toured with) recorded for Wand in 1963-1967, Nate Edmonds & Lonnie Youngblood respectively wrote and produced the flipside of the Chuck Jackson 45 "Every Man Needs A Down Home Girl / Need You There (To See Me Through)" (Wand WND 1151).
Maxine Brown released "If You Gotta Make A Fool Of Somebody / You're in Love" (Wand WND 1104) in November 1965 1. A Curtis Knight demo recording of "If You Gotta Make A Fool Of Somebody" from roughly the same time period exists, this could be a co-incidence or the demo might have had something to do with Wand.
Sue Records, Inc.
Hendrix was at one point contracted to Sue Records. Sue Records had an office at 1650 Broadway (Suite 1405) up to May/June 1964 2 after which the label moved to 265 West 54th Street where Jimi signed an "Exclusive Recording Artist Contract" with Sue Records, Inc. & Henry "Juggy" Murray Jr. on the 27th of July 1965.
Kama Sutra Records
The company moved to 1650 Broadway in September 1965. Kama Sutra´s sister company Buddah distributed the Isley Brothers T-Neck label from 1969 onwards and released the Jimi produced Eire Apparent LP Sunrise in 1968.
Cameo Parkway Records
Cameo Parkway had a New York City office at 1650 Broadway in 1965-1966 3, this is very likely the connection which brought about the three Lonnie Youngblood 45s released on Fairmount (a Cameo-Parkway subsidiary label), two of which Hendrix played on.
SOURCES
1 the Maxine Brown single "If You Gotta Make A Fool Of Somebody / You're in Love" (Wand WND 1104) was reviewed in Billboard issue 27 November 1965.
2 the address of Sue Records, Inc. is listed as 1650 Broadway in Billboard issue 2 May 1964 but has changed to 265 West 54th Street by Billboard issue 6 June 1964, hence the label office must have moved circa May / June 1964
3 a 1650 Broadway address for a Cameo / Parkway NYC office is listed in an ad in Billboard issues 8 May 1965 and 2 July 1966, probably other issues as well.
4 a listing of recording studios in the USA was published in Billboard issue 10 June 1972, the article list equipment, personnel, services, address and the year when the business started for each studio.
5 the address was listed in the Cash Box 6 July 1968 issue.