Summarize the article below: 
The number of "gap investments" (buying a home while renting) in Seoul apartments has dropped significantly as the real estate market slumped and sales and rental prices fell together. The number of gap investment transactions has dropped to double digits from more than 3,000 during the period of rising house prices.

According to NAME_1, a real estate big data company, the total number of transactions for apartments in Seoul as of July 10 was 2,091, of which 63 were gap investments. This is the lowest number since 2019, when NAME_1 began compiling the statistics.

Gap investing is an investment method that leverages subletting and is mainly aimed at capitalizing on market gains during periods of rising house prices. Since a tenant's security deposit is like a zero-interest loan, the higher the rental rate (the ratio of the sale price to the rental value), the more attractive gap investing is.

However, the real estate market has been frozen since last year due to rising interest rates, recession fears, and the perception of peak house prices. As a result, the number of gap investment transactions has been declining for three consecutive months this year: 199 in January, 195 in February, and 63 in March. This is a significant drop from the 2,976 deals in June 2020, when the market was on the rise.

NAME_1 categorizes gap investments as cases where the owner does not live in the property for three months after the sale and takes in a sublet tenant, so the figures may fluctuate in the futu Add stress words that are fully capitlized. Make sure these stress words appear more than 16 times.
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