Problem: Steranko was born in Reading, Pennsylvania. According to Steranko's authorized biography, his grandparents emigrated from Ukraine to settle in the anthracite coal-mining region of eastern Pennsylvania. Steranko's father, one of nine siblings, began working in the mines at age 10, and as an adult became a tinsmith. Steranko later said his father and uncles "would bootleg coal - they would go up into a mountain and open up a shaft.

By his account, Steranko learned stage magic using paraphernalia from his father's stage magician act, and in his teens spent several summers working with circuses and carnivals, working his way up to sideshow performer as a fire-eater and in acts involving a bed of nails and sleight-of-hand. At school, he competed on the gymnastics team, on the rings and parallel bars, and later took up boxing and, under swordmaster Dan Phillips in New York City, fencing. At 17, Steranko and another teenage boy were arrested for a string of burglaries and car thefts in Pennsylvania. Up through his early 20s, Steranko performed as an illusionist, escape artist, close-up magician in nightclubs, and musician, having played in drum and bugle corps in his teens before forming his own bands during the early days of rock and roll. Steranko, whose first band, in 1956, was called The Lancers, did not perform under his own name, claiming he used pseudonyms to help protect himself from enemies. He also claims to have put the first go-go girls onstage. The seminal rock and roll group Bill Haley and his Comets was based in nearby Philadelphia and Steranko, who played a Jazzmaster guitar, often performed in the same local venues, sometimes on the same bill, and became friendly with Haley guitarist Frank Beecher, who became a musical influence. By the late 1960s, Steranko was a member of a New York City magicians' group, the Witchdoctor's Club. Comics historian Mark Evanier notes that the influential comic-book creator Jack Kirby, who "based some of his characters ... on people in his life or in the news", was "inspired" to create the escape artist character Mister Miracle "by an earlier career of writer-artist Jim Steranko".

what name did he use if not his own name?

Answer with quotes: he used pseudonyms to help protect himself from enemies.

Background: Ukrainians (Ukrainian: ukrayintsi, ukrayintsi, [ukra'jinjtsji]) are an East Slavic ethnic group native to Ukraine, which is by total population the sixth-largest nation in Europe. The Constitution of Ukraine applies the term 'Ukrainians' to all its citizens. Also among historical names of the people of Ukraine, Rusyns (Ruthenians), Cossacks, etc. can be found. According to most dictionary definitions, a descriptive name for the "inhabitants of Ukraine" is Ukrainian or Ukrainian people.
Context: Most ethnic Ukrainians live in Ukraine, where they make up over three-quarters of the population. The largest population of ethnic Ukrainians outside of Ukraine lives in Russia where about 1.9 million Russian citizens consider themselves ethnic Ukrainians, while millions of others (primarily in southern Russia and Siberia) have some Ukrainian ancestry. The inhabitants of the Kuban, for example, have vacillated among three identities: Ukrainian, Russian (an identity supported by the Soviet regime), and "Cossack". Approximately 800,000 people of Ukrainian ancestry live in the Russian Far East in an area known historically as "Green Ukraine". According to some previous assumptions, an estimated number of almost 2.4 million people of Ukrainian origin live in North America (1,359,655 in Canada and 1,028,492 in the United States). Large numbers of Ukrainians live in Brazil (600,000), Kazakhstan (338,022), Moldova (325,235), Argentina (305,000), Germany (272,000), Italy (234,354), Belarus (225,734), Uzbekistan (124,602), the Czech Republic (110,245), Spain (90,530-100,000) and Romania (51,703-200,000). There are also large Ukrainian communities in such countries as Latvia, Portugal, France, Australia, Paraguay, the UK, Israel, Slovakia, Kyrgyzstan, Austria, Uruguay and the former Yugoslavia. Generally, the Ukrainian diaspora is present in more than one hundred and twenty countries of the world. The number of Ukrainians in Poland amounted to some 51,000 people in 2011 (according to Polish Census). Since 2014, the country has experienced a large increase in immigration from Ukraine. More recent data put the number of Ukrainian workers at 1.2 - 1.3 million in 2016. In the last decades of the 19th century, many Ukrainians were forced by the Tsarist autocracy to move to the Asian regions of Russia, while many of their counterpart Slavs under Austro-Hungarian rule emigrated to the New World seeking work and better economic opportunities. Today, large ethnic Ukrainian minorities reside in Russia, Canada, the United States, Brazil, Kazakhstan, Italy and Argentina. According to some sources, around 20 million people outside Ukraine identify as having Ukrainian ethnicity, however the official data of the respective countries calculated together doesn't show more than 10 million. Ukrainians have one of the largest diasporas in the world.
Question: WHAT ARE THE EAST SLAVIC ETHNIC?
Answer: Approximately 800,000 people of Ukrainian ancestry live in the Russian Far East in an area known historically as "Green Ukraine".

Question:
The Merchandise Mart (or the Merch Mart, or the Mart) is a commercial building located in the downtown Loop, of Chicago, Illinois, United States. When it opened in 1930, it was the largest building in the world, with 4,000,000 square feet (372,000 m2) of floor space. The art deco landmark is located at the junction of the Chicago River's branches. The building is a leading retailing and wholesale destination, hosting 20,000 visitors and tenants per day as of the late 2000s.
The Merchandise Mart was modernized in the late 1950s and 1960s. The Indian chiefs were removed and replaced with concrete plates in 1961, of minimal note to onlookers as skyscrapers did not rise on the north side of the river as predicted. Some of the carvings were later found in a suburban backyard and auctioned in 2014. In 1962, an entrance canopy was constructed over the south for vehicle use. In 1977, Skidmore, Owings & Merrill designed the Chicago Apparel Center, located on the west side of Orleans Street, which increased the Merchandise Mart's total floor space to 6,200,000 square feet (580,000 m2). Making use of plazas, esplanades and overlooks employed the waterfront location for pedestrian pleasure. In 1988, Helmut Jahn designed an enclosed pedestrian walking bridge over Orleans Street connecting the Mart and the Apparel Center. After a 10-year, $100 million modernization in the late 1980s that included public utility upgrades, Beyer Blinder Belle's commission in 1989 was to create additional perimeter entrances and restore the display windows, main entrance and lobby. On the south facade, the drive-through canopy was removed and two smaller doorways aside the main entrance were added. Display windows, painted over during the earlier modernization campaign, were restored with clear glass to showcase merchant's wares. New main and corner entrances were added to the rear facade, and the loading dock that occupied the north portion of the first floor of the river level was removed in order to use the bottom deck of North Bank Drive. Improvements to the lobby included restoration of the original glass curtain wall over the entrance, shop fronts and reception desk using terrazzo floors and wall sconces influenced by the original design. The project was completed in 1991. In November 2007, the building received LEED for Existing Buildings Silver recognition.
Answer this question using a quote from the text above:

How large is it?

Answer:
the Merchandise Mart's total floor space to 6,200,000 square feet (580,000 m2).