It really only takes a few superior stocks to grow a sizable investment portfolio. For example, investing $1,000 in the right stock can easily become $100,000 or more with enough time. The key is finding the right companies, in the right industries, with the right growth opportunities and long-term demand. Duke Realty Corp (DRE), Extra Space Storage (EXR 1.60%), and Independence Realty Trust (IRT 1.02%) are three real estate investment trusts (REITs) that check all of those boxes and could help carry your portfolio for years to come. Here's a closer look at why.

Duke Realty Corp

Industrial real estate has experienced tremendous growth over the past decade. The rise of e-commerce, which was accelerated greatly during the pandemic mixed with new supply chain concerns, has driven demand even further in 2021. This has helped industrial REITs like Duke Realty Corp have a monumental year in terms of performance.

Duke saw net effective rents grow 40.8% quarter-over-quarter in the fourth quarter of 2021 and increase 18.7% for the full year 2021. Net operating income (NOI) grew 180% year over year (YOY), core funds from operation (FFO) jumped nearly 14% YOY, while leasing volume reached the highest level for the company in history. Duke not only outperformed the S&P 500 over the past year, providing a 42% return for investors, but has outpaced the S&P 500 for the past ten years.

Results like this aren't exclusive to Duke. Most other industrial REITs are seeing similar results; however, its peers are much more richly valued, with price to FFO's in the 38 to 40 range. While Duke is still costly, with a price to FFO of 33 times, it's one of the more affordable options for investors to access the growing industrial real estate sector with a company that has a proven track record of sustainable growth. Given that long-term demand for industrial space is nowhere near wavering, I think Duke will continue to deliver strong results in the coming years.

Extra Space Storage

The self-storage industry has historically been one of the top-performing subsectors of REITs. For decades, this industry has provided double-digit returns. Just prior to the pandemic, self-storage had hit a slump thanks to overdevelopment outpacing demand. However, the pandemic changed all of that and helped self-storage REITs return with a vengeance.

Extra Space Storage is the second-largest self-storage REIT, having interest and ownership in 1,227 facilities across the U.S. and providing third-party management solutions to 827 facilities, making it the largest management company for self-storage in the country. 

Full-year earnings for 2021 will be released on February 23, but year to date, the company is already well on its way for an incredible year. Management fees have increased 23% for the nine months ended 2021, while it's added 53 new facilities to its portfolio through wholly owned acquisition and joint ventures. YOY rent growth as of Q3 2021 was 16.2%, an incredible jump when just two years ago rental growth for the entire year was 3.2%. 

Self-storage is an industry I think every investor should have exposure to, and while Extra Space Storage is hardly the only option, I do think its growth prospects and its price to FFO of 30 times makes it an appealing buy for long-term portfolio growth.

Independence Realty Trust

Independence Realty Trust is one of the newest and smaller residential REITs to hit the market. Really until 2021, most investors likely hadn't even heard of IRT. But the company made some major moves over the last year to help set it up for notable growth moving forward. The first was the merger with Steadfast Apartment REIT, which helped Independence Realty Trust double its portfolio and gain notable exposure to the booming Sun Belt region of the U.S. The company today now has ownership or interest in 78 communities, with around 70% of its net operating income being earned from the Sun Belt.

IRT doesn't invest in upscale apartments like much of its peers; instead, it focuses on Class B apartments in secondary suburban markets, many of which are experiencing double-digit rental growth right now. Its full-year earnings will help shine more light on its operations post-merger; however, blended lease rates for preliminary Q4 2021 were as high as 15.3% for IRT's portfolio and 14.2% for Steadfast Apartment REIT. Demand for rental properties doesn't appear to be slowing down, and with IRT's plan to renovate as many as 20,000 properties in the future, there's a lot of room to grow.

While they're certainly not immune to market risks, these 3 REITs companies have notable strengths and growth opportunities that make them great picks for carrying a portfolio. Long-term demand and diversification within the real estate industry mean these companies should see strong years ahead.