What Happened

On March 23, 2026, the parking garage associated with the Yosemite Office Plaza located at 3600 S. Yosemite Street in Denver experienced a partial collapse. No one was injured, and the incident did not cause any structural damage to the office building itself.

Building ownership is committed to resolving this matter responsibly and transparently. We recognize the inconvenience this situation has caused, understand the frustration tenants have experienced and remain fully dedicated to keeping the building safe, operational and as disruption-free as possible while the garage investigation and remediation process moves forward.

How We Addressed It

Within hours of the incident, and in the days that followed, we took decisive action on multiple fronts:

• We retained Martin/Martin, a highly respected Denver-based engineering firm with specific experience in garage collapses and related structural issues, to conduct a thorough assessment. They determined that the partial collapse did not cause structural damage to the office building, but they did recommend additional shoring in the basement that we have now completed.

• We provided all tenants with a full rent credit for the entire month of April to acknowledge the disruption the situation caused them.

• We quickly implemented a free valet parking program. It utilizes existing surface parking spaces at the property and we have also secured temporary off-site parking at neighboring properties.

• We now have an on-site property manager to provide a consistent local presence and be available to meet with tenants and address any concerns immediately.

• We have increased the on-site property engineer’s hours from 20 hours per week to full-time (40 hours per week) to provide more immediate, hands-on service at the property.

• We have notified our insurance carrier and provided claims information to all affected vehicle owners so they can seek recovery for their losses. Additionally, in recognition of the inconvenience caused, we have provided each affected vehicle owner with a $500 stipend to assist with alternative transportation while their insurance claims are being resolved.

What Happens Next

We have now completed a demo of the collapsed portion of the garage and removed the debris. Our engineering experts from Martin/Martin are examining the site and will deliver a formal report assessing the situation. If the report finds that the garage has multiple areas of structural damage consistent with the conditions found in the collapse zone, we will make a decision as to whether those areas can be effectively repaired or whether the extent of the damage — given the age and condition of the structure — is too significant to address through repair alone. If the necessary repairs are not feasible or would not provide a durable, long-term solution, the entire garage may ultimately need to be demolished. We are committed to making responsible, well-informed decisions based on the findings of the investigation and will provide an updated communication upon receipt of the engineering report, which is expected in late June.

Frequently Asked Questions

Administrative Questions

Q:    Who owns the building?

A:     The building and the parking garage are owned by KAS Yosemite LLC, a Colorado-based entity.

Q:    What is SF Partners role?

A:     SF Partners is the asset manager for the building.

Safety-Related Questions

Q:    Was anyone hurt in the partial garage collapse?

A:     No, there were no injuries.

Q:    Is the office building itself safe?

A:     Yes. We retained Martin/Martin, a highly respected Denver-based engineering firm with specific experience in garage collapses and related structural issues, to examine the office building and they determined that the incident did not cause any structural damage to the office building itself. It is safe.

Q:    Was the office building structurally affected by the partial collapse of the garage?

A:     No. The engineering firm Martin/Martin determined that the partial collapse did not cause structural damage to the office building. However, because the garage's east wall is shared with the building at the basement level, Martin/Martin recommended that additional shoring be installed along that wall before the building was reopened. That shoring work was completed, inspected and approved by the City, and the building was subsequently re-opened.

Q:    What immediate steps were taken following the partial collapse?

A:     Out of an abundance of caution, the office building was closed to determine whether the partial collapse of the garage caused any structural damage to the building itself. We then immediately retained Martin/Martin to conduct a thorough and expert engineering assessment. Their assessment confirmed that the partial collapse did not cause structural damage to the office building. As an additional precaution, Martin/Martin recommended — and we completed — supplemental shoring along the shared basement wall before the building was reopened.

Q:    When did the office building reopen, and is it currently operational?

A:     The building reopened on April 6, 2026, and has remained fully open and operational since that time. A subsequent full structural inspection of the entire building — requested by the City as an additional precaution and not limited to garage-related issues — was completed. Based on those results, the building has been reconfirmed to be safe. No structural issues related to the partial collapse were identified, nor were any unrelated structural concerns found that would render the building unsafe for occupancy.

Damage-Related Questions

Q:    Was any property damaged in the partial collapse of the garage?

A:     While there were approximately 75 vehicles in the garage at the time, only 10 vehicles were located within the collapse zone and could not be immediately removed safely. Unfortunately, those vehicles were lost as part of the demolition of the damaged section of the garage. We have notified our insurance carrier and provided claims information to all affected vehicle owners so they can seek recovery for their losses. Additionally, in recognition of the inconvenience caused, we have provided each affected vehicle owner with a $500 stipend to assist with alternative transportation while their insurance claims are being resolved.

How We are Supporting Tenants

Q:    Were building tenants compensated for the period during which the building was closed?

A:     Yes. Because tenants were denied access to the building for approximately nine days following the partial collapse, we recognized the disruption this caused and provided all tenants with a full rent credit for the entire month of April, regardless of any lease language to the contrary.

Q:    Is the garage currently open?

A:     No. The garage remains closed while an investigation continues to determine the cause of the partial collapse and to assess the appropriate remediation and repair work required. As an additional safety precaution, shoring has been installed throughout the garage to provide further structural support. That work was completed in April.

Q:    What steps is SF Partners taking to support tenants during this process?

A:     SF Partners has taken several steps to ensure that the building remains fully operational and to minimize inconvenience to tenants, including:

• Implementing a free valet parking program and securing temporary off-site parking at neighboring properties.

• Retaining an on-site property manager to provide a consistent local presence and be available to meet with tenants and address concerns immediately.

• Increasing the on-site property engineer’s hours from 20 hours per week to full-time (40 hours per week) to provide more immediate, hands-on service at the property.

Investigation-Related Questions

Q:    Who is conducting the investigation?

A:     We retained Martin/Martin, a highly respected Denver-based engineering firm with specific experience in garage collapses and related structural issues, to conduct a thorough assessment. We have also been working closely with the City and County of Denver.

Q:    What is causing the investigation to take time, and when will results be available?

A:     A comprehensive structural assessment of the entire garage must be completed — not just the area that collapsed — to evaluate the structural viability of the garage as a whole, given its age. Various tests are being conducted throughout the structure. A comprehensive report is expected to be issued soon.

Q:    What factors are being examined as potential contributors to the partial collapse?

A:     While the investigation is ongoing and final conclusions have not yet been reached, the following factors are currently under review:

• Historical waterproofing and seal-coating. Prior to our ownership, it appears the parking deck had not been seal-coated for waterproofing for more than 20 years. Industry standard practice calls for seal-coating every five to seven years. When we acquired the property in 2020, the entire deck was seal-coated, and another application had been scheduled for within the next one to two years. While the work completed was helpful in reducing future water intrusion, any deterioration that occurred prior to our ownership may already have taken place and may not have been reversible.

• Original construction of the collapsed beam. One area being evaluated is whether the beam that collapsed lacked sufficient reinforced concrete as part of its original construction. Investigators are also assessing whether other beams may have similar reinforcement deficiencies that could affect the structural integrity of other areas of the garage.

• Drain placement and water infiltration. It appears that several drains were placed over structural beams, including the beam that collapsed. This configuration may have increased water infiltration on the upper deck and contributed to the weakening of the collapsed beam. The investigation is also evaluating whether similar conditions may have affected other beams.

• Whether vehicles on the parking deck may have exceeded weight limits

• Whether snow removal companies over the years applied corrosive chemicals that contributed to structural damage.