What Is Regulation D? Reg D Rules for Real Estate Sponsors

Regulation D (Reg D) is a set of SEC rules in 17 CFR 230.500 through 230.508 that lets a company sell securities without registering them, as long as it meets the conditions of an exemption. Most real estate syndications use Rule 506(b) or 506(c), which have no dollar cap. If you are the sponsor, we built DoorRaise to handle the Reg D paperwork for apartment raises.

Why does Reg D exist?

Reg D exists because the Securities Act of 1933 requires every securities offering to be registered with the SEC unless an exemption applies. Registration is slow and expensive, so Reg D gives small and private issuers clear conditions to follow instead.

The SEC's investor education page on Regulation D describes it as providing a number of exemptions from registration. Companies that comply do not have to register the offering, but they must file a Form D electronically after their first sale.

Rule 506 works as a safe harbor tied to the Section 4(a)(2) private-offering exemption. In practice, that is what lets a sponsor raise money for an apartment building from investors without an IPO.

This post explains the framework. For how the whole deal fits together, see our guide to real estate syndication.

Which Reg D rules matter for real estate?

Three rules do most of the work: Rule 504, Rule 506(b) and Rule 506(c). Rule 506 is where nearly all syndications land because there is no dollar limit and states generally cannot require registration of the offering.

Rule	Dollar limit	Public advertising	Investors	Notes
504	$10,000,000 in 12 months	Generally no, with exceptions	Not limited by the rule itself	Not available to Exchange Act reporting companies, investment companies or blank-check companies; state registration or exemption can apply
506(b)	None	No	Unlimited accredited, plus up to 35 non-accredited who are sophisticated, in any 90 calendar days	Added disclosure required for non-accredited purchasers
506(c)	None	Yes	Accredited only, with reasonable steps to verify	Issuer carries the verification duty

The full text is at 17 CFR 230.504 and 17 CFR 230.506. Rule 504 offerings are also subject to bad actor disqualification, because Rule 504(b)(3) points to the Rule 506(d) standards.

A note on Rule 505, which older guides still mention: the SEC repealed it in a 2016 rulemaking and, according to the SEC's October 2016 announcement, raised Rule 504 from $1 million to $5 million in the same package. The SEC's later exempt-offering amendments, effective March 15, 2021, raised Rule 504 again to the current $10,000,000, per the SEC's compliance guide. Confirm the current text with counsel before relying on any limit.

Why most sponsors pick Rule 506

Rule 506 securities are "covered securities" under 15 U.S.C. 77r, which generally keeps states from requiring registration. States can still require copies of your federal filings, a fee and consent to service of process, and they keep their antifraud authority.

Rule 504 is not treated the same way, so a sponsor using it may face state registration or exemption requirements. That is a big reason Rule 506 dominates in syndications. See blue sky notice filings for the state side.

Rule 506(b) in one paragraph

Rule 506(b) allows no general solicitation or advertising, and caps non-accredited purchasers at 35 in any 90 calendar days. Each non-accredited purchaser must have enough knowledge and experience to evaluate the investment, alone or with a purchaser representative. The SEC's Rule 506(b) page lists these conditions along with the Form D and restricted securities points.

Rule 506(c) in one paragraph

Rule 506(c) allows general solicitation, but every purchaser must be accredited and the issuer must take reasonable steps to verify it. Our guides to what a 506(c) offering is and what general solicitation is go through both halves of that trade.

What does the issuer have to do?

An issuer using Reg D follows a short sequence: pick the rule, check for bad actors, prepare disclosure, sign subscriptions, file Form D and make state filings. Each step has its own rules, and your attorney should confirm the details for your deal.

Pick the rule that matches how you will find investors. Public reach points to 506(c). Raising from people you know points to 506(b).
Check for bad actors. Rule 506(d) disqualifies certain offenders. See the bad actor rule.
Prepare disclosure. A private placement memorandum is standard practice. Rule 502(b) information requirements apply when non-accredited investors take part in a 506(b) offering.
Sign subscription agreements and collect investor statements. See subscription agreements.
File Form D within 15 calendar days after the first sale. See Form D filing.
Make state notice filings where your investors live.

When is Form D due? (illustrative dates)

Form D is due no later than 15 calendar days after the first sale, and the deadline moves to the next business day if it lands on a weekend or holiday, under Rule 503. The dates below are illustrative.

If the first sale happens on Monday, November 2, 2026, then 15 calendar days later is Tuesday, November 17, 2026. If it happens on Friday, November 6, 2026, day 15 is Saturday, November 21, so the filing is due Monday, November 23.

Ask your attorney exactly when the "first sale" clock starts for your documents. You also amend Form D for material mistakes, changes in information, and annually if the offering continues.

What are restricted securities?

Restricted securities are securities you cannot freely resell because they were not registered. Rule 502(d) requires the issuer to use reasonable care to make sure buyers are not underwriters, which includes reasonable inquiry, written disclosure before sale that the securities are unregistered and restricted, and a legend on the ownership record.

This is one reason syndication interests are illiquid. An investor in a Reg D deal should expect to hold until the sponsor sells or refinances, and any early exit depends on the operating agreement and on finding a buyer. Our post on how to vet a syndication lists what to check.

Does Reg D mean the SEC approved the deal?

No. Reg D is an exemption from registration. The SEC does not review or approve a Reg D offering, and filing Form D is a notice, not a sign-off.

Form D lists basic facts such as names of executive officers, directors and promoters, and some offering details. Investors can look up filings on the SEC's EDGAR system, but a filing says nothing about whether the deal is good. Investors have to do their own homework.

A worked example (illustrative)

Take a sponsor planning to raise $3,200,000 of equity for a 40-unit building. All figures are illustrative.

The raise is under Rule 504's $10,000,000 cap, so Rule 504 is not blocked on size. 3,200,000 / 10,000,000 = 32% of the cap. But Rule 504 is not treated as a covered security the way Rule 506 is, so the sponsor may face state registration or exemption steps in each state where investors live.

If the sponsor expects investors in five states, that is five sets of state questions under Rule 504, versus notice filings under Rule 506. For many sponsors, that tilts the choice to Rule 506 even when the raise would fit under the Rule 504 cap.

The next question is 506(b) or 506(c). If 20 investors at an average of $160,000 would fund the raise (20 x $160,000 = $3,200,000) and the sponsor knows them all, 506(b) fits. If the sponsor wants to find those 20 through a public channel, 506(c) is the route.

Our take

Our take: for apartment syndications, the useful Reg D question is not "which rule has the most features" but "how will I find my investors, and can I document it." Everything else follows from that.

We think many first-time sponsors overbuild the legal structure and underbuild their records. Reg D does not require a particular design. It requires that you fit one exemption cleanly, keep evidence, and file on time.

We also think a PPM is worth having even when it is not strictly required. It forces you to put your plan, risks and fees in writing before you take money.

Trade-offs and who this is not for

Reg D gives you speed and privacy, and it costs you liquidity, public reach (under 506(b)) or investor breadth (under 506(c)). It is not the right tool for everyone.

Not for small retail investors. Under 506(c), only accredited investors can buy. See options without accreditation.
Not for sponsors who want a public crowd of small checks. Regulation Crowdfunding is a different framework. See Reg CF for real estate.
Not a shortcut around disclosure. Antifraud rules apply to the PPM, the deal page and your social posts.
Not a one-time task. Filings, amendments and tax reporting continue while you own the property.

A common mistake is treating Form D as the finish line. The filing is a notice, and the real work is the documents, the investor records and the state steps behind it.

How DoorRaise fits in

DoorRaise helps sponsors raise equity for apartment buildings with 5+ units from people who already trust them, under Rule 506(b) or 506(c). We are software, legal document preparation, escrow coordination and verification services. We are not a law firm, broker-dealer, investment adviser, funding portal, bank or escrow agent, and we do not hold investor money.

Our three flat fees line up with the Reg D steps. The $500 setup fee covers forming the deal's LLC, investor documents from attorney-approved templates, an escrow account in the deal's name, the deal page and accreditation checks on every investor. The $5,000 closing fee, paid from the funds raised and only if the deal closes, covers attorney review of the offering documents, sponsor and property checks, the Form D filing and electronic signing. The $3,500 yearly fee covers bookkeeping, the tax return and K-1s.

State filing fees are included in the $5,000 closing fee. We take 0% of the raise or profits.

Ready to raise? Create your free sponsor page or see pricing.

FAQ

Is Regulation D the same as a private placement?

A Reg D offering is one kind of private placement. A private placement is any offering made under an exemption instead of registration.

Do I need a lawyer for a Reg D offering?

Practically, yes. Securities counsel advises on the exemption, solicitation, the PPM and bad actor questions. Reg D is a legal framework, and this post is general information.

Can non-accredited investors join a Reg D deal?

Under Rule 506(b), up to 35 sophisticated non-accredited purchasers in any 90 calendar days can, with added disclosure. Under Rule 506(c), no. See non-accredited options.

What happened to Rule 505?

The SEC repealed it in a 2016 rulemaking, so it is no longer an option. Today Regulation D has Rule 504 and Rule 506 (with its (b) and (c) paths), and those are the ones sponsors compare.

Do I still file in every state?

You generally make notice filings in states where investors live, and timing, forms and fees vary by state. Many states accept a copy of Form D, often through NASAA's Electronic Filing Depository. Verify the rules for each state with your attorney.

Is Reg CF or Reg A better for real estate?

They solve different problems. Reg CF is built for small online raises from many investors, and the SEC's exempt-offering chart lists its cap at $5 million in 12 months. Compare the framework in our post on Reg CF for real estate.

Sources

This article is general information, not legal, tax or investment advice. Talk to a securities attorney about your deal. DoorRaise is not a law firm, broker-dealer, investment adviser or funding portal.