BXP vs SLG: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. BXP and SLG share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined BXP and SLG exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

BXP Inc, which traded as Boston Properties until its 2024 rebrand, is a self-managed real estate investment trust and the largest publicly traded developer, owner, and manager of Class A office properties in the United States. Its portfolio spans roughly 186 commercial properties totaling approximately 53.5 million net rentable square feet, concentrated in six coastal gateway markets: Boston, New York, San Francisco, Los Angeles, Seattle, and Washington DC. The holdings are predominantly premier office and life-sciences workplaces, supplemented by retail, residential, and a hotel, plus a development and redevelopment pipeline. BXP generates revenue chiefly from long-term leases with corporate, law-firm, financial, technology, and life-sciences tenants, and it develops new towers on owned land to add value beyond simply collecting rent.

Full BXP guide

SL Green Realty Corp. is a fully integrated real estate investment trust (REIT) and Manhattan's largest office landlord, focused on acquiring, managing, and maximizing the value of New York City commercial properties. As of March 2026 the company held interests in roughly 55 buildings totaling about 30.8 million square feet, anchored by trophy assets such as One Vanderbilt (home of the SUMMIT observation deck) and One Madison Avenue. Beyond straight ownership, SLG runs an active debt-and-preferred-equity investment book and periodically recycles capital through asset sales and joint ventures.

Full SLG guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• BXP drivers: Flight to quality within office; Rising occupancy and raised FFO guidance.
• SLG drivers: Manhattan office recovery and leasing momentum; Trophy assets and SUMMIT.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: The dominant risk is the secular shift to hybrid and remote work, which has structurally lowered office space demand and left vacancy elevated in several of BXP's own markets, particularly San Francisco and Washington DC. For SLG, sLG is highly concentrated in Manhattan office real estate, so a downturn in New York City office demand, tenant defaults, or a shift toward remote work would hit it directly with little diversification to cushion the blow.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick BXP if you believe its drivers more; SLG if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the BXP and SLG guides.

BXP. For a REIT, funds from operations (FFO) matters more than GAAP EPS because it adds back large non-cash real estate depreciation. On the raised 2026 guidance of roughly $6.90 to $7.04 in FFO per share against a share price near $59, BXP trades at a low-to-mid single-digit multiple of FFO, a discount that reflects the market's caution on office rather than a lack of cash generation. The roughly 4.8 percent dividend yield and a share price well below pre-2020 levels are the clearest signals of how much sector pessimism is embedded in the valuation.

SLG. SLG reported Q1 2026 FFO of about $0.84 per share and reaffirmed full-year FFO guidance of roughly $4.40 to $4.70 per share, even as it booked a GAAP net loss of about $1.20 per share. REITs are generally valued on FFO and net asset value rather than earnings per share, so the net loss reflects heavy depreciation more than cash-flow weakness. The high dividend yield and elevated leverage are the two figures that most define how the market prices the stock.

Headline figures (approximate, July 2026): BXP shows revenue (ttm) ~$3.5 billion, ffo per share (q1 2026) ~$1.59, fy 2026 ffo guidance (midpoint range) ~$6.90 to $7.04, dividend yield (ttm) ~4.8%; SLG shows revenue (ttm) ~$1.0B, q1 2026 revenue ~$253M, q1 2026 ffo ~$0.84/share, 2026 ffo guidance ~$4.40 to $4.70/share.

BXP and SLG are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined BXP and SLG exposure against your real portfolio. It is not an investment adviser.