The Fit for Purpose report emerged from an independent review of the trust's resources and governance by Scottish Parliament presiding officer George Reid.
An NTS representative said: "There is nothing in the report about redundancies. It says we should carry out a property audit, which we have already started. It will be ready for next year's AGM. The report doesn't recommend selling any heritage properties. It's not about selling, it's about changing management."
The review recommended a new mission statement, an altered management structure and a review of the trust's properties and assets, as well as management partnerships with other bodies.
NTS chief executive Kate Mavor said: "Reid and his review team correctly identified that the trust has been heavily over-governed for far too long and that its management has been held back through such a top-heavy structure.
"Work is already underway on a strategic plan. The review gives us a clear indication that we must put conservation at the centre of everything we do. A new mission statement will remind everyone that the trust is here to play a crucial part in caring for Scotland's natural and cultural heritage.
"We fully recognise that the trust cannot conserve the nation's heritage on its own. We fully support the review's proposal for partnerships. This area needs careful management and conservation will continue to be a key consideration."
NTS members will be able to discuss and debate the recommendations at the AGM in Glasgow on 25 September.